Essay On Osmosis Lab

Essay on Osmosis lab
Abstract
The objective of this experiment was to test the effect of a specialized type of diffusion called osmosis, "which involves in selective transport of water
molecules across a selectively permeable membrane" (Lab Manual 2nd edition). It was hypothesized that osmosis will occur when there is an uneven
distribution of solute in a solvent. The more abundant the solute is in solvent, the higher the rate of osmosis through the diffusion gradient forming a
hypertonic or hypotonic solution. Solvent with equal or no solute forms an isotonic solution. Throughout this lab, data was collected and compiled to
analyze these effects across selectively permeable membranes. The results indicated that the water molecules indeed move from...show more content...
The second bag filled with distilled water, submerged in a beaker with water, had no significant difference in weight as time progressed indicating the
solution was isotonic. The third bag filled with 40% maltose solution, submerged in a beaker filled with distilled water, expended insignificantly,
indicating that water molecules from the beaker were able to pass through the bag filling it to capacity, but sugar molecules were unable to pass
through the bag. Finally the fourth bag, which had 40% maltose solution in bag as well as the beaker, also did not have any significant changes, once
again indicating the solution was isotonic. The last experiment pertaining to this activity was done to test for sugar in test tubes using Benedict's
solution. All three test tubes (1,3,4) showed a change in color to orange, except for the second test tube, which turned light blue. These results indicated
that test tube 1,3,4 had sugar molecules present, except for the 2nd one, which had only water. Even though the first tube only had water, it still turned
orange indicating that sugar molecules somehow got into the solution. Based on the raw data provided above for the dialysis bag experiment, the
results confirmed that permeability is selective, where water molecules easily passed through the bag, but maltose molecules did not. It was evident
that these sugar molecules were too big to pass through this selectively permeable membrane.
The following activity was performed to
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Osmosis Lab Report Discussion
Introduction Osmosis is when water passes through a cell membrane, it is also form of a diffusion, which is a form of passive transport. Osmosis will
continue to until an equilibrium is reached which is when the solutions are isotonic. This means that the solution has the same amount of solute on
both sides. If the solution is hypertonic, it has more solute in the solution. In this situation water will move towards it. if the solution is hypotonic, it
has less solute in the solution. Whereas in this situation, water will move out of the solution. The purpose of this lab is to test the effect of osmosis on
cucumber slices. If a cucumber slice is placed in a hypertonic solution, then the mass of the cucumber slice will decrease. Whereas, if...show more
content...
Then, each group of students received the necessary materials to complete the experiment. When the students received the cups, they labeled cups to
distinguish between the salt solution, distilled water, and control group. After weighing the cups and finding the mass of the cucumbers, the students
poured 50 ml of water in one cup, 50 ml of salt solution in the other, and left the control cup empty. Then, the students placed the cucumbers into the
cups and waited 30 minutes for the results. After the 30 minutes, the students removed the cucumbers from each solution and dried the cucumbers with
paper towels. The students then weighed the cucumbers again and recorded their results. Lastly, the students found the difference from the original
mass of the cucumbers and recorded their results.
Results
Analysis/Discussion
The independent variable of this experiment were the different types of the solutions used, while the dependent variable was the mass of the cucumber
slices. The constants were, the amount of liquid used and the time the cucumbers were left in the solution. While the control was the cucumber left in
the cup with no solution. The students made a hypothesis saying that they believe that the cucumber slices put into the salt solution would decrease in
mass while the cucumber put in the distilled water would increase in mass. In the end, the results of the experiment supported the students

Why Are Osmosis Important
Osmosis is absolutely essential because it keeps up the balance of almost everything in you body. If something is lacking in one area, osmosis will
pick up the slack by moving one resource to the lacking area. The nephron is the most important part of the kidney because its regulates what can
and cant be absorbed, not only that, but it deals with how many solutes and water can be in your system. If we didn't have the nephron our bodies
would never know when to drink water and we would most likely die. Our kidneys and osmosis play a special role in the excretion of harmful
substances that our bodies absorb.
Osmosis helps the kidneys by making it easier to transport solutes and around to the different parts of the kidney for filtration, re–absorption, and
excretion.
Think of marine mammals, which breathe air like we do but drink only salt water. How do aquatic organisms deal with the different concentrations of
salt in the water:
It all has to do with the concentrations of solutes in the blood stream of the animal. Some crustaceans rely on cell...show more content...
Compare this to the passage of nitrogen through the human body. How and why does it finally leave the body:
Nitrogen makes up 3% of our body. It is an essential compound for the production of proteins and amino acids. Nitrogen is normally taken in through
food. Humans can't take it from the soil or air so we need other organisms to turn it into something we can use. Nitrogen can be recycled, but it
generally leaves through the urine because its a key component of ammonia. If the nitrogen can still be used it will be mixed with the filtrate and
reabsorbed.
A study of kidney function usually focuses on the nephrons, and the filtrate that passes through them. But there are other important elements as well.
Discuss the importance of the medulla, the epithelial cells of the

Osmosis And Diffusion Paper
This week in Mrs.Johnson's biology class, her students learned about osmosis and diffusion. There was an article about it called Osmosis
Confusion: 60 Years and Counting. It was written by Eric M. Kramer on May 1, 2013. The article talks mainly about osmosis; it explains how
osmosis was interpreted differently in the 1900s due to lack of communication in the biology, chemistry and physics field. This subject is important
because osmosis is in our daily life such as hydrating yourself with water. It relates to our studies because in fact, it is what we're studying. The article
explained how osmosis worked. Also, it explained osmosis plays an important role in our lives. They discussed how it keeps the correct balance
between the water content

Osmosis Across The Cell Membrane
The cell membrane is a barrier that controls what substances can go in and out of the cell. Through cell membrane substances such as Oxygen and
nutrients molecules enters the cell while carbon dioxide and other wastes come out through it. To understand many aspects of Physiology, it is
important to understand the mechanism that transports substance across the cell membrane. sThe flow of substances into and out of the cells is called
Osmosis. During osmosis, the water molecules flow through a semipermeable membrane from a less concentrated solution through a higher
concentrated one in effort to equalize the concentration of water on both sides of the membrane. Hypertonic solution is any solutions with a higher salt
concentration than the body

Essay on Osmosis
Osmosis
Introduction
I obtained my scientific knowledge from the "AQA science: double award modular." This is an experiment that will explore the osmosis theory
To make this experiment safe I will wear goggles to protect my eyes and also will make sure that when using the borer to cut thepotato I have a white
tile underneath.
The experiment will be a fair test as I will keep the weight of the cut potato the same throughout the water and sugar solutions. I will try to keep the
potatoes surface area and volume the same. I will make sure that both pieces of potato are placed in their solutions at the same time and pulled out
together. I will make the weight of the potatoes the same by...show more content...
Example:
[IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE]In the root–hair cell of a plant the surrounding soil will have a more concentrated water
solution than inside the cell, thus leading to the water solution in the soil osmosing into the root–hair cell. The cell which is next to the root hair cell is
separated by the partially permeable membrane. This leads to the more concentrated water solution in the root hair cell osmosing into the cell next to it.
This procedure of osmosis through the cells carries on until the cells reach the xylem. The xylem finally carries the water solution upwards to the areas
that need it.
I have decided to vary the amount of sugar solution (%) in which the potato chip is placed in. I am using this variable as I think it will give a good
range of results because unlike changing the size of the potato this should prove that the theory of higher concentration to a lower concentration is right.
To ensure accuracy I will use equipment such as the top pan balance to measure the weight of the potatoes accurately. I will also use a pipette to
measure the about of solution I put into the test tubes. The drop sizes of the solution vary so I will try and keep them roughly the same size but there
possible could be some inaccuracy located. I will use a borer to cut parts of the potato and a white tile

Osmosis Essay
Osmosis controlled assessment
The difference between the structure of animal and plant cell:
All animals have eukaryotic cells and they consist of a nucleus which contains all the bound cellular organelles. (1) Some of the organelles in the cell
include the cell membrane, cytoplasm, centrioles, endoplasmic reticulum, golgi complex, lysosomes, microtubules, mitochondria, ribosomes, nucleolus
and nucleopore.(1)(3) All of these organelles help with the functioning of the cell.
OrganelleFunction
Cell membraneThe cell membrane controls the movement of substances in and out of the cell by being selectively permeable.(2)(3) It also covers the
outer layer of the cell.(1)(3)
CytoplasmThe cytoplasm is a usually gel–liked formula and this is where...show more content...
(9)
Red blood cells placed in an isotonic solution will stay the same as no osmosis takes place. (9) In human cells, water moves into the cell by osmosis,
where water moves from an area of low solute concentration to an area of high solute concentration. This is so it evens out the ratio of solvent and
solute particles. (10) This creates a dynamic equilibrium that maintains the status of the cell. (13) (14) No change will occur in the cell. (13) This
means the cells retain their normal shape. (21)
Plant cells placed in a hypertonic solution will be dehydrated to become plasmolysed (9) as the water moves from a high water concentration inside
the cell to a low water concentration outside of the cell by osmosis down the concentration gradient. (10)
Red blood cells placed in a hypertonic solution will also shrivel up and shrinks as they lose water (9). Water moves from a high water concentration
inside the cell to a low water concentration outside of the cell by osmosis down the concentration gradient. Animals can regulate the concentration of
water and mineral salts in the blood by

The Effect Of Osmosis On Eukaryotic Cells
Biology EEI – Osmosis in Potatoes
Purpose:
The purpose of this investigation is to observe the effect of Osmosis in Eukaryotic cells; more specifically Potatoes under different sodium chloride
solutions.
Hypothesis:
The hypotonic solution will demonstrate results of osmosis by gaining mass (g) by the conclusion of the testing period. This is because there is an
increased presence of sodium chloride in the potato over the distilled water solution. Therefore the solvent moves from a low solute concentration area
to a high solute concentration area, within the potato. The hypertonic solution will demonstrate results of osmosis resulting in less mass (g) by the
conclusion of the testing period. This is because the sodium in the potato is less than the sodium chloride solution, therefore the water in the potato
moves from a low solute concentration area to a high solute concentration area by losing mass (g) by the conclusion of the testing period.
Introduction:
Cells are the building blocks of life for all living organisms, and are the smallest structural and functional unit of a living organism. Eukaryotic cells and
Prokaryotic cells are different in profound ways, and are found in vastly different environments. The eukaryotic cell contains membrane–bound
organelles which include the nucleus, a plasma membrane, ribosomes and other exclusive membrane bound internal structures such as mitochondria
and lysosomes. Prokaryotic cells are vastly different from eukaryotic cells,

Osmosis Research Paper
Homeostasis is the ability to maintain a steady, stable internal state. The plasma membrane provides the cell with a barrier that regulates homeostasis
by protecting the cell and only permitting certain substances to enter and leave. The goal of the investigation is to use model cells to see how different
concentrations of alcohol affect the cell's size. The guiding question is, how does alcohol affect the size of cells? This question relates to the
information provided because it will exemplify the stability of the cell and plasma membrane throughout several tests of alcohol concentrations.
To start the experiment, four different dialysis tubes were inserted with 10 mL of distilled water and knotted at the ends. These tubes served as the
...show more content...
This is how cells maintains homeostasis. Diffusion is a process that molecules perform to move from higher concentrations to lower concentrations. The
molecules move to lower concentrations to create an equilibrium, a state of balance. Some molecules cannot move through the plasma membrane
because the membrane is selectively permeable. This means that only certain substances are allowed to pass through. Osmosis, the diffusion of water
molecules from high to low concentrations, was performed in the investigation. The solutions of alcohol were hypertonic, containing higher
concentrations of solutes, to the cells, which were hypotonic, containing a low concentration of solutes. The solution of 0% alcohol was isotonic to the
cell. Meaning that there is the same amount of solutes inside and out of the cell. The alcohol is impermeable to the membrane in this investigation
because the molecule is bigger. Water, on the other hand, is permeable to the membrane. Since the solutions have higher concentrations of the
solute(alcohol) than the cell, they get dehydrated and need more water. Therefore, the cells have 100% water so the water exits the cell into the
substance so it can be in the lower concentration; creating the

Osmosis Experiment Essay
Osmosis Experiment Experiment to investigate how equal masses of potato are effected in different concentrations of 1molar sucrose soloution.
Aim:
To investigate if osmosis occurs in potatoes, and if so, how it affects potatos of equal mass (2.5g) in different molar solutions of sucrose and water.
Apparatus:
–Cutting tile which will be used to cut the potato on. –Knife which will be used to peel the potato with and to cut to correct mass. –Burette which will
be used to measure the solutions acurately. –Distilled water to make up solutions as part of the experiment sucrose to make up part of the experiment
–Potatoes to...show more content...
Also, the potatoes have been changed from length to mass as mass will provide a more reliable set of results to analyse.
Background Information:
Osmosis, the net or overall movement of solvent molecules (often water) from a region where they are at a higher concentration to an area where they
are at a lower concentration through a partially permeable membrane (sometimes called a selectively permeable or semi–permeable membrane).
Substances often move from an area of higher concentration to an area of lower concentration by diffusion, the result of random particle movement.
In osmosis, two solutions are separated by a membrane that will only let the solvent particles pass through. This means that the solvent continues to
move freely along a concentration gradient. However, the other substance involved–the solute–cannot move freely because the particles are too large
and cannot pass through the membrane. This means that although there is random movement of the solvent molecules in both directions across the
membrane, there will be a net movement of solvent into the area where it is at the lowest concentration–in other words, into the solution containing the
highest levels of

Osmosis in Red Onion Cells
Osmosis in Red Onion Cells
By: Youssef Gharib
Brief Description of Osmosis in Red Onion cells:
Osmosis is the diffusion of water from an area of low concentration to an area of high concentration across a semi–permeable membrane. The purpose
of this lab is to compare the three different types of solutions affect on the relative size of the vacuole to the cell, the outer membrane of onion red cells
(tunics) are used to figure out the different types. In the red onion you can see effects promptly when the onion cells are placed in different type of
solutions. The effect of the solutions is shown through the purple part within the membrane since that's where the vacuoles are present.
Question:
How will the vacuole inside the cells...show more content...
The percentages recorded in the data table though were not accurate since they were just assumptions because the tools to correctly measure the
percent change were not present. Since the experiment was only conducted once, there were no repeated trials, leading the data to be more prone to
errors and uncertainties. Another error in the data was that at first many slices of the tunic had to be peeled to finally get a single strand of cells,
because every time a slice would be peeled, there would be a double layer of cells, causing it to be hard to see through the microscope.
Conclusion and Evaluation:
In the lab, many conclusions were drawn from the results found. The data calculated, and the observations recorded supported the hypothesis, since in
the data the saline solutions caused the vacuoles to shrink, and the deionized water caused the vacuole to stay the same. The saline solutions caused
the vacuoles to shrink because since there was more salt outside the vacuole, the vacuole became hypertonic causing it to release water and absorb salt
into the vacuole. The use of a control group in this experiment establishes the basis of a means for comparison between the different levels of IV and
the control group. The procedure was not as descriptive as possible, and could have been more explanatory, and instructive. Limitations in the
experiment could have been that the tunic of the red onion was not thin enough to record

Essay Osmosis Experiment
Background Knowledge:
Osmosis definition:
Diffusion of water molecules through a semi permeable membrane from a higher concentration to a lower concentration until the concentration on both
sides is equal.
Osmosis in animal cells:
The cell membrane is the partially permeable membrane in animal cells. If the cells were placed in distilled water they gain water, swell and burst.
This is known as haemolysis.
Osmosis in plant cells:
The cellulose cell wall of plant cells is fully permeable. Therefore it's the cell membrane of a plant cell which acts as the semi–permeable membrane,
deciding what gets into and out of the cell.
When plant cells are placed in water the following happens:
Water enters the cell, the reason is that...show more content...
The amount of water lost from the cell depends on the concentration of the solution in which it was placed. If only a small amount of water is lost the
cell cannot remain turgid and wilting of the plant occurs. Cells which aren't turgid are described as being flaccid.
If a plant cell looses too much water by osmosis, plasmolysis results. The permanent vacuole shrinks in size as it loses water and the cell membrane
pulls away from the cell wall.
Active uptake: Plants require a range of mineral ions for normal development. Ions such as nitrates and magnesium are absorbed by the plant from the
soil. This absorption takes place in the root hair cells that form the outer layer of the plant roots. In most soils there are more of these ions in the root
hair cells than these are in the surrounding soil.
Method:
Using a cork borer cut out the middle of both carrots and potatoes, cut both the carrots and potatoes the same length and size and measure them with a
ruler to make sure, then weigh them. Using only the core of both will make the experiment fair.
Starting with the carrots, add the first amount of concentrated sugar solution (which is distilled water) and repeat this another 2 times.

Then do the same for all 6

Lab Report On Osmosis Experiment Essay
Lab Report 4 Osmosis in Potatoes
Introduction
In this lab we are going to discovery how osmosis works using a semi–impermeable membrane a potato slice. Osmosis is known as the movement of
water in and out of a cell. To understand how this works we must understand two terms. Hypotonic means the environment has less solutes compared to
the inside of the cell. Hypertonic means that the environment has more solutes compared to the inside of the cell. With osmosis water will always
move from hypotonic too hypertonic. So the question is will water move into the potato or out of the potato? Will these results change when placed in
different morality of salt water? To calculate these results, we will measure the mass of potatoes cut into equal sizes then soak these potato slices in
different morality of NaCl for thirty minutes and measure the mass change in each potato slice.
Materials
Potato (four slices)
Knife
Beaker (4)
Salt Solution .2, .4, .6 mol
Distilled water
Food Scale
Paper Towels
Methods
First I gather all my materials needed for the experiment (see materials list). Second I peel and slice potatoes weigh each potato in grams. Get these
slices to weigh the same in mass because if they vary to much in mass that could affect the results of the experiment. Third I place each potato in its
own beaker. Fourth once the potatoes are placed in beakers I make sure to place enough solution to fully cover the potato. Each beaker should have a
different amount of

Lab Report: Osmosis Essay examples
Aim The aim of this experiment is to investigate the effects of different concentrations of sugar solutions on the rate of osmosis in plant cells.
Equipment
5mm borer Knife White Tile
Potatoes Beakers Measuring cylinder Stopwatch Sugar solutions Paper towels
Balance Pipette
Scientific knowledge
Osmosis Osmosis is the movement of water particles from an area of high concentration to an area...show more content...
I will have the 11 experiments set up simultaneously as the experiments will all begin and end at the same time. I will first collect 11 small
beakers and two identical small measuring cylinders. I will label the beakers to identify which concentrations are in each one. The concentrations
I will use are 0%, 2%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18% and 20%, therefore I will label each beaker with one of these numbers. I will then
collect the 0% concentration of sugar solution and use the pipette to transfer it into the measuring cylinder until 30ml is reached. I will put the
measuring cylinder on a flat surface and read from the meniscus to ensure accuracy. This will be poured into the first beaker. I will then wash the
measuring cylinder out and leave it upside down to drain whilst I use the second measuring cylinder to measure 30ml for 2% concentration. I will
do this for all the concentration until all the beakers are filled. I will then collect several potatoes, a white tile, a knife, a 5mm borer and paper
towels. I will cut 11 cylinders out of the potatoes. I will then measure 4cm on a ruler and cut the cylinders to size. I will try to make the cuts as
straight as possible so that all the cylinders have the same surface area, and the same chance of osmosis. I will then dab–dry each cylinder, weigh them
on a balance and record them in a table as the previous mass. I will dab–dry them to remove any excess water. When I start

Potato Osmosis Lab Report
Osmosis, the diffusion of water through a semi–permeable membrane, shows that water tends to flow from a hypoosmotic environment to a
hyperosmotic environment. There are many proposed explanations for why and in what context this osmosis occurs. One explanation is a
"concentration of particles" explanation called van't Hoff's Law. This law states that the size of a particle will not change the water potential or
occurrence of osmosis in a solution–submerged cell, only the amount of the solute in the solution will affect osmosis. To test this, we used three
different sized solutes–sucrose, glucose, and NaCl–to see if the size of the solute had an effect on the osmosis of water into or out of white potato cells
that were submerged in solutions containing the 3 solutes. We found that the size of the particles of solute does not affect osmosis of water into or out
of the potato cells, only the amount of particles present in the outside solution, thus supporting van't Hoff's Law.
Introduction
In this lab, the concentrations of different solutions were used to display the effect different sizes and different amounts of solute would have on the
movement of water into or out of white potato cells.
For this lab, white potatoes were used to find the effect of the size of particles on the osmosis and water potentials of the potatoes. The simplicity of
the potato and the ease of access made them good, constant variables for the experiment. The average expected water potential for the

Osmosis and Diffusion
Diffusion and Osmosis in an egg Low concentration 1.1 Diffusion is the process of molecules spreading from areas of high concentration to areas of
low concentration. High concentration 1.1 Osmosis is the diffusion of water molecules through a semi–permeable membrane from the area of low
concentration of solute to the area of high concentration of solute. 1.2 Diffusion is important to living cells because it's the way they take in materials
from the environment, and they also prevent themselves of unwanted materials produced in their cells. Osmosis on the other hand, is also important to
living cells, because it's the way that water can enter and leave their cells through diffusion (class note–the movement of molecules). 1.3 Aim:...show
more content...
The egg with the most amount of sucrose solution gained the most weight. 4.1 Specific organism involved in Osmosis and diffusion: In the
human body osmosis and diffusion is involved in the process of cleaning/filtering the kidney, where diffusion is used to selectively move solutes
through the cells and Osmosis is used to absorb 99% of the water (Ivyrose Ltd. 2003). 4.2 How osmosis and diffusion is used in the kidneys:
Diffusion is a form of transport, which requires no energy (passive transport), and allows substances to flow from areas of high concentration, to
areas of low concentration, and Osmosis happens when water is flowed from areas of high concentration, to areas of low concentration. In the case
of the kidneys, when human kidneys filter/clean blood it uses three mechanisms, two of the mechanisms is, Osmosis and diffusion. Most of the
energy that our kidneys consume is reabsorbed by sodium ions (Na+), which are solutes. As the concentrations of Sodium ions (and other substances
/solutes which are absorbed with it) are high in the filtrate solution, they are moved from the tubular fluid into the cells of the proximal convoluted
tubule (PCT), which are then moved through other cells by diffusion. Osmosis is used to absorb 99% of the water (Ivyrose Ltd. 2003). 4.3 How the
egg is relevant to the kidney: Osmosis and diffusion in an egg is relevant to how it's used in kidneys, because the egg represents the kidney,

The Importance Of Osmosis In Science
Osmosis has long been taught to students, especially those in high school or introductory science classes, as a simple variation of diffusion. Because
osmosis is the first of many natural phenomena understood by students, it is important that it is understood correctly. This however, is not the case. In
fact, discrepancies exist between how osmosis is taught and understood between physics and chemistry or biology [1]. Moreover, since the agreement
of the real processes involved within the physics community back in 1951, no progress has been made with osmosis in biology and chemistry
education [2].
What makes these discrepancies a topic of discussion is not that they exist, but rather, that they exist and are prevalent in education. In fact, these
discrepancies are speculated to be harmful to the understanding of many biological and chemical processes including blood circulation, kidney
function, fluid flow, and cell expansion in fruit and flowers [2]. According Eric M. Kramer, a professor of physics at Bard College at Simon's Rock,
once errors such as these are learned they influence thinking throughout ones professional career [1]. For this reason, it is clear that this issue is
pressing in relation to a proper understanding of many biological and chemical processes.
Above all else, what exactly is osmosis? Where does the currently accepted understanding in biology and chemistry differ from physics? The answer
lies in five misconceptions, as explained by Kramer and Myers

Solutes And Osmosis
The idea behind this experiment is to know how does relative concentrations of solutes affect the direction of osmosis. Osmosis is the diffusion of
water through a membrane. Apparently, for this experiment, the dialysis tube would play the role of a cell membrane since it contains small pores.
These pores would distinguish which liquids are permeable and which ones are not. The liquids that are going to be used for this experiment includes
sucrose solution and water. My hypothesis and prediction for this experiment is that the dialysis tube that contains water in and water outside of it will
not have a change in mass. While the dialysis tube that contains water in and sucrose outside of it will eventually lose mass. In addition, the

Osmosis
Advanced Placement Biology
В®
AP Biology
Lab 1
281
EDVO–Kit # Storage:
Principles & Practice of Diffusion & Osmosis
Store entire experiment at room temperature.
EXPERIMENT OBJECTIVE
The objective of this experiment is to develop an understanding of the molecular basis of diffusion and osmosis and its physiological importance.
Students will analyze how solute size and concentration affect diffusion across semi–permeable membranes and how these processes affect water
potential. Students will also calculate water potential of plant cells.
EDVOTEK, Inc. 1–800–EDVOTEK www.edvotek.com
EVT 080423AM
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AP
Biology

EDVO–Kit # 281
Principles & Practice of Diffusion and Osmosis
Table of Contents
Lab #
1...show more content...
A system is Material moving most stable when it has reached equilibrium. A out of the cell system will tend to go to equilibrium (lowest, accessible
energy state) in the absence of added energy (Figure 2).
Background Information
Figure 1 – Diffusion of Molecules
Random movement of solute (dissolved particles) and solvent (water molecules) will result in an evenly distributed solution.
Material moving into the cell
=
Figure 2 – Dynamic Equilibrium
Molecules are still in motion, but there is no net change when dynamic equilibrium is reached.
OSMOSIS
Osmosis is a special type of diffusion. It is the diffusion of water molecules across a semipermeable membrane (a membrane that allows for the
diffusion of certain solutes and water) from an area of higher water concentration to one of lower water concentration. For example, if a 1 M aqueous
starch solution is separated from a .5 M aqueous starch solution by a semi–permeable membrane, then water molecules will move from the .5 M
aqueous starch solution (higher water molecule concentration) toward the more concentrated 1M starch solution (lower water molecule concentration)
until an equilibrium of water molecules exists between the two solutions. Since the semi–permeable membrane did not allow for the passage of starch
molecules, the 1M–starch solution will gain in volume as the water moves in (Figure 3).
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Essay On Osmosis Lab

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