The document discusses various types of indicators, acids, bases and salts. It defines indicators as substances that change color or smell to indicate whether a substance is an acid or base. It describes natural indicators like turmeric and litmus, and synthetic indicators like phenolphthalein and methyl orange. It then discusses the Arrhenius, Lewis and Bronsted-Lowry theories of acids and bases. It provides properties, identification tests and examples of important acids and bases. Finally, it discusses salts, their pH, and methods for manufacturing common salts like sodium chloride, sodium hydroxide and calcium hypochlorite.
Ppt acids, bases and salts , dr mona shrivastava , founder masterchemcla...DR MONA Srivastava
Viewers,
A very basic topic of chemistry for grade x is acid , bases and salts. A topic with lot of scope to add activities and make students understand better. Used all possibility to add colorful activities to explain concepts. Hope its beneficial for students.
Dr MOna Srivastava
Founder-
Master chem Classes
Ppt acids, bases and salts , dr mona shrivastava , founder masterchemcla...DR MONA Srivastava
Viewers,
A very basic topic of chemistry for grade x is acid , bases and salts. A topic with lot of scope to add activities and make students understand better. Used all possibility to add colorful activities to explain concepts. Hope its beneficial for students.
Dr MOna Srivastava
Founder-
Master chem Classes
Acids, Bases and Salts (Chemistry 'O' level)Faiz Abdullah
Chemistry 'O' level syllabus: Acids, Bases & Salts
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all about metal and nonmetal of class 10 from physical to chemical....
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Chapter 3.metals and non metals priya jhaPriya Jha
An element is the simplest form of matter that cannot be split into simpler substances or built from simpler substances by any ordinary chemical or physical method. There are 118 elements known to us, out of which 92 are naturally occurring, while the rest have been prepared artificially. Elements are further classified into metals, non-metals, and metalloids based on their properties, which are correlated with their placement in the periodic table.Metals
With the exception of hydrogen, all elements that form positive ions by losing electrons during chemical reactions are called metals. Thus metals are electropositive elements with relatively low ionization energies. They are characterized by bright luster, hardness, ability to resonate sound and are excellent conductors of heat and electricity. Metals are solids under normal conditions except for Mercury.Nonmetals
Elements that tend to gain electrons to form anions during chemical reactions are called non-metals. These are electronegative elements with high ionization energies. They are non-lustrous, brittle and poor conductors of heat and electricity (except graphite). Non-metals can be gases, liquids or solids.Metalloids
Metalloids have properties intermediate between the metals and nonmetals. Metalloids are useful in the semiconductor industry. Metalloids are all solid at room temperature. They can form alloys with other metals. Some metalloids, such as silicon and germanium, can act as electrical conductors under the right conditions, thus they are called semiconductors. Silicon for example appears lustrous, but is not malleable nor ductile (it is brittle - a characteristic of some nonmetals). It is a much poorer conductor of heat and electricity than the metals. The physical properties of metalloids tend to be metallic, but their chemical properties tend to be non-metallic. The oxidation number of an element in this group can range from +5 to -2, depending on the group in which it is located.
Acids, Bases and Salts (Chemistry 'O' level)Faiz Abdullah
Chemistry 'O' level syllabus: Acids, Bases & Salts
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all about metal and nonmetal of class 10 from physical to chemical....
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Chapter 3.metals and non metals priya jhaPriya Jha
An element is the simplest form of matter that cannot be split into simpler substances or built from simpler substances by any ordinary chemical or physical method. There are 118 elements known to us, out of which 92 are naturally occurring, while the rest have been prepared artificially. Elements are further classified into metals, non-metals, and metalloids based on their properties, which are correlated with their placement in the periodic table.Metals
With the exception of hydrogen, all elements that form positive ions by losing electrons during chemical reactions are called metals. Thus metals are electropositive elements with relatively low ionization energies. They are characterized by bright luster, hardness, ability to resonate sound and are excellent conductors of heat and electricity. Metals are solids under normal conditions except for Mercury.Nonmetals
Elements that tend to gain electrons to form anions during chemical reactions are called non-metals. These are electronegative elements with high ionization energies. They are non-lustrous, brittle and poor conductors of heat and electricity (except graphite). Non-metals can be gases, liquids or solids.Metalloids
Metalloids have properties intermediate between the metals and nonmetals. Metalloids are useful in the semiconductor industry. Metalloids are all solid at room temperature. They can form alloys with other metals. Some metalloids, such as silicon and germanium, can act as electrical conductors under the right conditions, thus they are called semiconductors. Silicon for example appears lustrous, but is not malleable nor ductile (it is brittle - a characteristic of some nonmetals). It is a much poorer conductor of heat and electricity than the metals. The physical properties of metalloids tend to be metallic, but their chemical properties tend to be non-metallic. The oxidation number of an element in this group can range from +5 to -2, depending on the group in which it is located.
Class-10-Chapter-01-Science-Chemistry-Acid bases and salts.ppsxSoftcare Solution
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PowerPoint Presentation on the topic - 'Acids, Bases and Salts'. For Class - 10th.
Created By - 'Neha Rohtagi'
I hope that you will found this presentation useful and it will help you out for your concept understanding.
Thank You!
Numerous acids and bases are naturally present in our surroundings. Citric acid is abundant in fruits such as oranges and lemons, tartaric acid is found in tamarind, malic acid is present in apples, and lactic acid is a component of milk and dairy products. Additionally, hydrochloric acid naturally occurs in gastric juices.
Similarly, various bases are also naturally occurring, including lime water. In our daily lives, we frequently use these acids for various purposes. For instance, acetic acid, commonly known as vinegar, is a staple in the kitchen. Boric acid is utilized in laundry, while baking soda finds its way into cooking, and washing soda is employed for cleaning. The diverse applications of these acids and bases showcase their significance in our everyday activities.
For more information, visit. www.vavaclasses.com
THE IMPORTANCE OF MARTIAN ATMOSPHERE SAMPLE RETURN.Sérgio Sacani
The return of a sample of near-surface atmosphere from Mars would facilitate answers to several first-order science questions surrounding the formation and evolution of the planet. One of the important aspects of terrestrial planet formation in general is the role that primary atmospheres played in influencing the chemistry and structure of the planets and their antecedents. Studies of the martian atmosphere can be used to investigate the role of a primary atmosphere in its history. Atmosphere samples would also inform our understanding of the near-surface chemistry of the planet, and ultimately the prospects for life. High-precision isotopic analyses of constituent gases are needed to address these questions, requiring that the analyses are made on returned samples rather than in situ.
Nutraceutical market, scope and growth: Herbal drug technologyLokesh Patil
As consumer awareness of health and wellness rises, the nutraceutical market—which includes goods like functional meals, drinks, and dietary supplements that provide health advantages beyond basic nutrition—is growing significantly. As healthcare expenses rise, the population ages, and people want natural and preventative health solutions more and more, this industry is increasing quickly. Further driving market expansion are product formulation innovations and the use of cutting-edge technology for customized nutrition. With its worldwide reach, the nutraceutical industry is expected to keep growing and provide significant chances for research and investment in a number of categories, including vitamins, minerals, probiotics, and herbal supplements.
This pdf is about the Schizophrenia.
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Cancer cell metabolism: special Reference to Lactate PathwayAADYARAJPANDEY1
Normal Cell Metabolism:
Cellular respiration describes the series of steps that cells use to break down sugar and other chemicals to get the energy we need to function.
Energy is stored in the bonds of glucose and when glucose is broken down, much of that energy is released.
Cell utilize energy in the form of ATP.
The first step of respiration is called glycolysis. In a series of steps, glycolysis breaks glucose into two smaller molecules - a chemical called pyruvate. A small amount of ATP is formed during this process.
Most healthy cells continue the breakdown in a second process, called the Kreb's cycle. The Kreb's cycle allows cells to “burn” the pyruvates made in glycolysis to get more ATP.
The last step in the breakdown of glucose is called oxidative phosphorylation (Ox-Phos).
It takes place in specialized cell structures called mitochondria. This process produces a large amount of ATP. Importantly, cells need oxygen to complete oxidative phosphorylation.
If a cell completes only glycolysis, only 2 molecules of ATP are made per glucose. However, if the cell completes the entire respiration process (glycolysis - Kreb's - oxidative phosphorylation), about 36 molecules of ATP are created, giving it much more energy to use.
IN CANCER CELL:
Unlike healthy cells that "burn" the entire molecule of sugar to capture a large amount of energy as ATP, cancer cells are wasteful.
Cancer cells only partially break down sugar molecules. They overuse the first step of respiration, glycolysis. They frequently do not complete the second step, oxidative phosphorylation.
This results in only 2 molecules of ATP per each glucose molecule instead of the 36 or so ATPs healthy cells gain. As a result, cancer cells need to use a lot more sugar molecules to get enough energy to survive.
Unlike healthy cells that "burn" the entire molecule of sugar to capture a large amount of energy as ATP, cancer cells are wasteful.
Cancer cells only partially break down sugar molecules. They overuse the first step of respiration, glycolysis. They frequently do not complete the second step, oxidative phosphorylation.
This results in only 2 molecules of ATP per each glucose molecule instead of the 36 or so ATPs healthy cells gain. As a result, cancer cells need to use a lot more sugar molecules to get enough energy to survive.
introduction to WARBERG PHENOMENA:
WARBURG EFFECT Usually, cancer cells are highly glycolytic (glucose addiction) and take up more glucose than do normal cells from outside.
Otto Heinrich Warburg (; 8 October 1883 – 1 August 1970) In 1931 was awarded the Nobel Prize in Physiology for his "discovery of the nature and mode of action of the respiratory enzyme.
WARNBURG EFFECT : cancer cells under aerobic (well-oxygenated) conditions to metabolize glucose to lactate (aerobic glycolysis) is known as the Warburg effect. Warburg made the observation that tumor slices consume glucose and secrete lactate at a higher rate than normal tissues.
This presentation explores a brief idea about the structural and functional attributes of nucleotides, the structure and function of genetic materials along with the impact of UV rays and pH upon them.
Richard's entangled aventures in wonderlandRichard Gill
Since the loophole-free Bell experiments of 2020 and the Nobel prizes in physics of 2022, critics of Bell's work have retreated to the fortress of super-determinism. Now, super-determinism is a derogatory word - it just means "determinism". Palmer, Hance and Hossenfelder argue that quantum mechanics and determinism are not incompatible, using a sophisticated mathematical construction based on a subtle thinning of allowed states and measurements in quantum mechanics, such that what is left appears to make Bell's argument fail, without altering the empirical predictions of quantum mechanics. I think however that it is a smoke screen, and the slogan "lost in math" comes to my mind. I will discuss some other recent disproofs of Bell's theorem using the language of causality based on causal graphs. Causal thinking is also central to law and justice. I will mention surprising connections to my work on serial killer nurse cases, in particular the Dutch case of Lucia de Berk and the current UK case of Lucy Letby.
Deep Behavioral Phenotyping in Systems Neuroscience for Functional Atlasing a...Ana Luísa Pinho
Functional Magnetic Resonance Imaging (fMRI) provides means to characterize brain activations in response to behavior. However, cognitive neuroscience has been limited to group-level effects referring to the performance of specific tasks. To obtain the functional profile of elementary cognitive mechanisms, the combination of brain responses to many tasks is required. Yet, to date, both structural atlases and parcellation-based activations do not fully account for cognitive function and still present several limitations. Further, they do not adapt overall to individual characteristics. In this talk, I will give an account of deep-behavioral phenotyping strategies, namely data-driven methods in large task-fMRI datasets, to optimize functional brain-data collection and improve inference of effects-of-interest related to mental processes. Key to this approach is the employment of fast multi-functional paradigms rich on features that can be well parametrized and, consequently, facilitate the creation of psycho-physiological constructs to be modelled with imaging data. Particular emphasis will be given to music stimuli when studying high-order cognitive mechanisms, due to their ecological nature and quality to enable complex behavior compounded by discrete entities. I will also discuss how deep-behavioral phenotyping and individualized models applied to neuroimaging data can better account for the subject-specific organization of domain-general cognitive systems in the human brain. Finally, the accumulation of functional brain signatures brings the possibility to clarify relationships among tasks and create a univocal link between brain systems and mental functions through: (1) the development of ontologies proposing an organization of cognitive processes; and (2) brain-network taxonomies describing functional specialization. To this end, tools to improve commensurability in cognitive science are necessary, such as public repositories, ontology-based platforms and automated meta-analysis tools. I will thus discuss some brain-atlasing resources currently under development, and their applicability in cognitive as well as clinical neuroscience.
Seminar of U.V. Spectroscopy by SAMIR PANDASAMIR PANDA
Spectroscopy is a branch of science dealing the study of interaction of electromagnetic radiation with matter.
Ultraviolet-visible spectroscopy refers to absorption spectroscopy or reflect spectroscopy in the UV-VIS spectral region.
Ultraviolet-visible spectroscopy is an analytical method that can measure the amount of light received by the analyte.
3. INDICATORS
INDICATORS ARE SUBSTANCES WHICH INDICATE
WHETHER A GIVEN SUBSTANCE IS A N ACID OR A BASE
BY CHANGE IN COLOUR OR SMELL.
TYPES OF INDICATORS :
1. NATURAL INDICATORS
2. SYNTHETIC INDICATORS
3. OLFACTORY INDICATORS
4. NATURAL INDICATORS ;
INDICATORS ARE OBTAINED FROM NATURE AND INDICATE BY CHANGING THE COLOUR.
1. TURMERIC
2. LITMUS
3. RED CABBAGE
4. HYDRANGEA FLOWER PETALS
SYNTHETIC INDICATORS;
INDICATORS ARE MANUFACTURED CHEMICALLY IN FACTORIES OR INDUSTRIES .
1. PHENOLPHTHALEIN
2. METHYL ORANGE
OLFACTORY INDICATORS;
INDICATORS WHICH DETECT AN ACID OR BASE BY A CHANGE IN SMELL.
1. ONION JUICE
2. VANILLA EXTRACT
3. CLOVE OIL
6. ARRHENIUS THEORY -- AN ACID IS A SUBSTANCE THAT DISSOCIATES AND PRODUCES HYDROGEN ION ( H+
) OR HYDRONIUM ION ( HзO + ) WHEN DISSOLVED IN WATER .
LEWIS THEORY -- THE SUBSTANCES OR ELEMENTS WHICH HAVE A TENDENCY TO ACCEPT ONE LONE PAIR
OF ELECTRONS .
BRONSTED-LOWRY -- THE SUBSTANCES WHICH HAVE A TENDENCY TO DONATE PROTONS.
WHAT ARE ACIDS ?
WATER IS NEITHER AN ACID NOR A BASE, BUT IN CERTAIN CASES CAN ACT
AS EITHER AN ACID OR A BASE
7. PROPERTIES OF ACIDS
● ACIDS + ACTIVE METALS ------> SALT + H²
● ACID + METAL CARBONATE / BICARBONATE -----> SALT + WATER +
CARBON DIOXIDE
● ACID + BASE -----> SALT + WATER
● ACID + METALLIC OXIDE ( BASIC ) ----> SALT + WATER
8. REMAINS
COLOURLESS IN
ACIDS
ACIDS TURN BLUE
LITMUS TO RED.
IDENTIFICATION OF ACIDS
TASTE METHYL
ORANGE
LITMUS TEST PHENOLPHTHALEIN
ACIDS ARE SOUR
IN TASTE . TURN METHYL
ORANGE TO DARK
ORANGE /RED.
01 03
02 04
9. TYPES OF ACIDS
( STRENGTH ) -
1. STRONG ACID -- COMPLETE IONIZATION TAKES PLACE *EG: HCl , HNO3
2. WEAK ACID -- PARTIAL IONIZATION TAKES PLACE *EG:HNO2 , HCN
(CONCENTRATION) -
1. CONCENTRATED ACID -- ACID> WATER
2. DILUTE ACID -- WATER> ACID GOOD CONDUCTORS OF ELECTRICITY
( SOURCE ) -
1. ORGANIC ACID -- OBTAINED FROM PLANTS AND ANIMALS (WEAK IN
NATURE ) *EG: CH3COOH , HCOOH , H2CO3
2. INORGANIC ACID -- OBTAINED FROM MINERALS
RED ANTS CONTAIN FORMIC ACID WHICH CAN BE USED FOR
MEDICAL TREATMENT.
10. LIST OF IMPORTANT ACIDS ;
1. CH3COOH - ACETIC ACID
2. HCOOH - FORMIC ACID
3. (COOH)2 - OXALIC ACID
4. HNO3 - NITRIC ACID
5. H2SO4 - SULPHURIC ACID
6. HCl - HYDROCHLORIC ACID
7. HCN - HYDROCYANIC ACID
8. HNO2 - NITROUS ACID
9. H2SO3 - SULPHUROUS ACID
10. C4H6O6 - TARTARIC ACID
11. H2CO3 - CARBONIC ACID
1. COOH INDICATES
ORGANIC ACIDS .
2. WHEN AN ACID IS
GREATLY DILUTED IT
CONCENTRATION OF
H+ IONS PER UNIT
VOLUME
INCREASES.
11. ARRHENIUS THEORY -- AN BASE IS A SUBSTANCE THAT DISSOCIATES AND PRODUCES HYDROXIDE ION
(OH-)
LEWIS THEORY -- THE SUBSTANCES OR ELEMENTS WHICH HAVE A TENDENCY TO DONATE ONE LONE PAIR
OF ELECTRONS .
BRONSTED-LOWRY -- THE SUBSTANCES WHICH HAVE A TENDENCY TO ACCEPT PROTONS.
WHAT ARE BASES ?
12. PROPERTIES OF BASES
● BASE + AMPHOTERIC METAL -----> SALT + H²
● BASE + NON METAL OXIDE (ACIDIC)-----> SALT + WATER
● BASE + NON METAL CARBONATE / BICARBONATE -----> NO
REACTION .
AMPHOTERIC METALS -
METALS WHICH PRODUCE HYDROGEN GAS UPON REACTING WITH AN ACID OR A
BASE .
Sb , Zn , Al , Pb , As , Sn ------> these metals are used as anions
1. Sb > SbO3 = -1 { ANTIMI NATE }
2. Zn > ZnO2 = -2 { ZINCATE }
3. Al > AlO2 = -1 { META ALUMINATE }
4. Pb > PbO2 = -2 { PLUMBATE }
5. As > AsO3 = -3 { ARSENATE }
6. Sn > SnO2 = -2 { STANNATE}
13. CHANGES TO PINK
IN BASES.
BASES TURN RED
LITMUS TO BLUE.
IDENTIFICATION OF BASES
TASTE METHYL
ORANGE
LITMUS TEST PHENOLPHTHALEIN
BASES ARE
BITTER IN TASTE . TURN METHYL
ORANGE TO
YELLOW .
01 03
02 04
14. TYPES OF BASES
( STRENGTH ) -
1. STRONG BASE-- COMPLETELY DISSOCIATE IN AN AQUEOUS SOL.
2. WEAK BASE -- PARTIALLY DISSOCIATE IN AN AQUEOUS SOL.
( CONCENTRATION )
1. CONCENTRATED BASE-- BASE > WATER
2. DILUTE BASE-- WATER > BASE
16. POINTS TO REMEMBER
● WHEN DILUTING AN ACID ,ALWAYS ADD THE ACID TO THE
WATER USING A BEAKER , WHILE CONSTANTLY STIRRING
THE MIXTURE .
● BASES ARE NOT VERY VIGOROUS WHEN REACTING WITH WATER
AND HENCE CAN BE ADDED IN ANY WAY, EITHER THE WATER TO
THE BASE OR THE BASE TO THE WATER .
** BOARDS Q. !
17. WHY!?
WATER SHOULD NOT BE ADDED TO
CONCENTRATED ACIDS BECAUSE
THIS REACTION IS HIGHLY
EXOTHERMIC IN NATURE AND IF THE
WATER IS DROPPED OVER THE ACID ,
THE HEAT ENERGY RELEASED MAY
CAUSE THE MIXTURE TO SPLASH OUT
AND CAUSE SEVERE BURNS .
18. KEEP IN MIND!
● ALL ALKALI ARE BASES BUT ALL BASES ARE
NOT ALKALI.
IMP.
20. WHAT IS pH ?
pH
STANDS FOR POWER OF HYDROGEN
POTENTIAL OF
HYDROGEN
A UNIVERSAL INDICATOR HAS A pH RANGE FROM ZERO {0} TO FOURTEEN {14}
THAT INDICATES THE ACIDITY OR BASICITY OF A SOLUTION .
A NEUTRAL SOLUTION HAS A pH OF 7
* pH = - log ₁₀ [H+]
pH is equal to the negative logarithm of concentration of H+ ions while the log
base is 10
21. pH PAPER
POWER AND COLOUR
0-2 --- DARK RED
3-5 --- ORANGE (ish)
6-7 --- PARROT GREEN
7 --- GREEN
8+ --- DARK GREEN
22. FOR PURE WATER :
H+ = OH- = 10 ^-7 mole/litre
# [ value of H+ ions is equal to the
concentration of OH- ions in pure
water ]
* VALUE OF CONCENTRATION =
mole/litre
23. USES OF pH IN
EVERYDAY LIFE
● BLOOD
● TOOTH DECAY
● SOIL
● DIGESTIVE SYSTEM
31. WHAT DETERMINES THE pH OF SALTS ?
● A SALT OF A STRONG ACID AND A STRONG
BASE WILL BE NEUTRAL . ( pH = 7)
● A SALT OF A STRONG ACID AND WEAK BASE
WILL BE ACIDIC IN NATURE ( pH < 7 )
● A SALT OF A WEAK ACID AND A STRONG
BASE WILL BE BASIC IN NATURE ( pH > 7 )
● FOR A SALT OF A WEAK ACID AND A WEAK
BASE , THE pH IS DETERMINED BY USING THE
pH SCALE.
32. WHEN CO2 IS ADDED TO LIME WATER , IT
WILL TURN MILKY DUE TO THE FORMATION
OF A WHITE PRECIPITATE OF CALCIUM
CARBONATE .
HOWEVER , WHEN EXCESS CO2 IS ADDED
HERE , THE MILKY COLOUR WILL DISAPPEAR
DUE TO THE FORMATION OF CALCIUM
BICARBONATE WHICH IS SOLUBLE IN WATER
.
TESTING OF CARBON DIOXIDE GAS .
34. COMMON SALT
{NaCl}
COMMON SALT IS FORMED BY THE MIXTURE OF
HYDROCHLORIC ACID AND SODIUM HYDROXIDE
SOLUTION .
- IT IS USED IN FOOD
NaOH + HCl → NaCl + H2O
35. CAUSTIC SODA / sodium hydroxide
{NaOH}
WHEN ELECTRICITY IS PASSED THROUGH AN AQUEOUS
SOLUTION OF SODIUM CHLORIDE ( brine solution ) , THE
SODIUM CHLORIDE DECOMPOSES INTO ITS
COMPONENTS AND FORMS CAUSTIC SODA .
2NaCl + 2H20 -(ELECTRIC CURRENT)→ NaOH + H2 + Cl2
36. BLEACHING POWDER/ calcium hypochlorite
/calcium oxychlorite {CaOCl2}
BLEACHING POWDER IS OBTAINED BY THE ACTION OF
CHLORINE ON DRY SLAKED LIME .
Ca(OH)2+ Cl2 → CaOCl2 + H2O
On standing for a longer time , it undergoes auto-oxidation
which leads to the decrease in the bleaching action of
bleaching powder.
37. USES OF BLEACHING POWDER
1. IT IS USED IN BLEACHING TEXTILES SUCH AS
COTTON AND LINEN IN THE TEXTILE INDUSTRY.
2. IT IS USED AS A DISINFECTANT FOR WATER TO
MAKE IT FREE FROM GERMS .
3. IT IS USED AS AN OXIDISING AGENT IN MANY
CHEMICAL INDUSTRIES .
38. BAKING SODA/sodium bicarbonate {NaHCO3}
*THIS PROCESS IS CALLED SOLVAY PROCESS *
IT IS PRODUCED BY USING SODIUM CHLORIDE ,
WATER , CARBON DIOXIDE AND AMMONIA AS THE RAW
MATERIALS .
NaCl + H2O + CO2 + NH3 → + NH4Cl +
NaHCO3
WHAT HAPPENS WHEN BAKING SODA IS HEATED DURING COOKING ?
→ SODIUM BICARBONATE DECOMPOSES INTO SODIUM CARBONATE ,
WATER AND CARBON DIOXIDE.
39. USES OF BAKING SODA
1 2 3
FOR MAKING BAKING
POWDER , WHICH IS
A MIXTURE OF
BAKING SODA AND
A MILD EDIBLE ACID
SUCH AS TARTARIC
ACID
IT IS AN
INGREDIENT IN
ANTACIDS . BEING
ALKALINE IT
NEUTRALIZES
THE EXCESS ACID
IN THE STOMACH
AND PROVIDES
RELIEF .
IT IS USED IN
SODA - ACID
FIRE
EXTINGUISHERS
40. IMPORTANT
1.
NaHCO3 + H+ → CO2 + H20 + SODIUM SALT OF THE ACID
WHAT HAPPENS WHEN
BAKING POWDER IS
HEATED OR MIXED IN
WATER?
CARBON DIOXIDE PRODUCED IN THIS REACTION CAUSES BREAD OR CAKE
TO RISE , MAKING THEM SOFT AND SPONGY.
41. WASHING SODA/sodium carbonate.decahydrate
{Na2CO3 . 10H2O}
IT IS OBTAINED BY HEATING BAKING SODA AND
RE-CRYSTALLIZING IT.
NaHCO3 → Na2CO3 + H2O
Na2CO3 + 10H2O → Na2CO3.10H2O
SODIUM CARBONATE IS A WHITE CRYSTALLINE SUBSTANCE . ITS
SOLUTION IN WATER IS ALKALINE IN NATURE . ITS MAIN PROPERTY
IS TO REMOVE DIRT/GREASE FROM CLOTH.
42. USES OF WASHING SODA
● IT IS USED IN GLASS , SOAP AND PAPER INDUSTRIES .
● IT IS ALSO USED FOR THE MANUFACTURING OF SODIUM
COMPOUNDS ( INSECTICIDES AND PESTICIDES ) SUCH AS BORAX . IT
ALSO REMOVES PERMANENT HARDNESS OF WATER.
● IT IS USED AS A CLEANSING AGENT IN DETERGENTS AND SOAPS IN
HOUSES .
43. PLASTER OF PARIS /calcium sulphate hemihydrate
{CaSO4 . 1/2H2O}
IT IS OBTAINED BY HEATING GYPSUM AT 100℃ OR
373 K
CaSO4 . 2H2O - HEAT→ CaSO4 . ½ H2O
--WHEN GYPSUM IS HEATED ABOVE 400K , ANHYDROUS POP IS
FORMED ( DEAD - BURNT ) WHICH DOES NOT HAVE THE
PROPERTY OF HARDENING .
-- WHEN POP IS MIXED WITH WATER , IT FORMS GYPSUM , GIVING
A HARD SOLID MASS.
44. USES OF POP
● IT IS USED BY DOCTORS FOR FIXING OF FRACTURES .
● IT IS ALSO USED FOR MAKING DECORATIVE PIECES AND FOR MAKING
DESIGNS ON CEILING .
46. WHAT IS IT?
THE CRYSTALS OF SALT OF SOME COMPOUNDS APPEAR TO
BE DRY ( ANHYDROUS ) BUT ACTUALLY CONTAIN SOME
WATER MOLECULES ATTACHED TO THEM . THESE WATER
MOLECULES CONTAIN ACTUAL WATER WHICH IS KNOWN AS
WATER OF CRYSTALLIZATION AND SUCH SALTS ARE CALLED
HYDRATED SALTS .
CuSO4. 5H2O , CaSO4.2H2O , CaSO4. ½ H2O