- Conductivity is a measure of a solution's ability to conduct electricity, which depends on the presence, concentration, mobility, and charge of ions in the solution.
- Conductivity is measured between two electrodes and reported in units of micromhos per centimeter or millisiemens per meter.
- A solution's conductivity is directly proportional to the electrode surface area and inversely proportional to the distance between electrodes.
It is an electrochemical method of analysis used for the determination or measurement of the electrical conductance of an electrolyte solution by means of a conductometer.
Electric conductivity of an electrolyte solution depends on :
Type of ions (cations, anions, singly or doubly charged
Concentration of ions
Temperature
Mobility of ions
The main principle involved in this method is that the movement of the ions creates the electrical conductivity. The movement of the ions is mainly depended on the concentration of the ions.
The electric conductance in accordance with ohms law which states that the strength of current (i) passing through conductor is directly proportional to potential difference & inversely to resistance.
i =V/R
Conductance is an ability of a material to allow the passage of current or fluid or temperature through different materials. It is opposite of resistance through a path, higher the conductivity of material lower is its resistance. It is most commonly used with electrical circuits, though it is also used in fluid and thermals. Copy the link given below and paste it in new browser window to get more information on Conductance:-
http://www.transtutors.com/homework-help/electrical-engineering/conductance.aspx
It is an electrochemical method of analysis used for the determination or measurement of the electrical conductance of an electrolyte solution by means of a conductometer.
Electric conductivity of an electrolyte solution depends on :
Type of ions (cations, anions, singly or doubly charged
Concentration of ions
Temperature
Mobility of ions
The main principle involved in this method is that the movement of the ions creates the electrical conductivity. The movement of the ions is mainly depended on the concentration of the ions.
The electric conductance in accordance with ohms law which states that the strength of current (i) passing through conductor is directly proportional to potential difference & inversely to resistance.
i =V/R
Conductance is an ability of a material to allow the passage of current or fluid or temperature through different materials. It is opposite of resistance through a path, higher the conductivity of material lower is its resistance. It is most commonly used with electrical circuits, though it is also used in fluid and thermals. Copy the link given below and paste it in new browser window to get more information on Conductance:-
http://www.transtutors.com/homework-help/electrical-engineering/conductance.aspx
more chemistry contents are available
1. pdf file on Termmate: https://www.termmate.com/rabia.aziz
2. YouTube: https://www.youtube.com/channel/UCKxWnNdskGHnZFS0h1QRTEA
3. Facebook: https://web.facebook.com/Chemist.Rabia.Aziz/
4. Blogger: https://chemistry-academy.blogspot.com/
Physical Chemistry
Amperometry: Definition, classification, theory, technique and applications of amperometric titration, titration curve shapes, factor affection current flow during analysis.
more chemistry contents are available
1. pdf file on Termmate: https://www.termmate.com/rabia.aziz
2. YouTube: https://www.youtube.com/channel/UCKxWnNdskGHnZFS0h1QRTEA
3. Facebook: https://web.facebook.com/Chemist.Rabia.Aziz/
4. Blogger: https://chemistry-academy.blogspot.com/
Physical Chemistry
Amperometry: Definition, classification, theory, technique and applications of amperometric titration, titration curve shapes, factor affection current flow during analysis.
High frequency Titrations is an analytical technique in which a radio frequency electric field is applied for which electric conductance of analytical substance governs the response of detector.
• Electrolytes : Definition, Strong and weak electrolytes and their conductance measurement, Ions and electrical conductivity by ions
• Kohlrausch law of Independent Migration of Ions
• Applications of Kohlrausch law
• Transference No. and its determination using Moving Boundary Method
• Factors affecting transport number
Climate Change All over the World .pptxsairaanwer024
Climate change refers to significant and lasting changes in the average weather patterns over periods ranging from decades to millions of years. It encompasses both global warming driven by human emissions of greenhouse gases and the resulting large-scale shifts in weather patterns. While climate change is a natural phenomenon, human activities, particularly since the Industrial Revolution, have accelerated its pace and intensity
WRI’s brand new “Food Service Playbook for Promoting Sustainable Food Choices” gives food service operators the very latest strategies for creating dining environments that empower consumers to choose sustainable, plant-rich dishes. This research builds off our first guide for food service, now with industry experience and insights from nearly 350 academic trials.
UNDERSTANDING WHAT GREEN WASHING IS!.pdfJulietMogola
Many companies today use green washing to lure the public into thinking they are conserving the environment but in real sense they are doing more harm. There have been such several cases from very big companies here in Kenya and also globally. This ranges from various sectors from manufacturing and goes to consumer products. Educating people on greenwashing will enable people to make better choices based on their analysis and not on what they see on marketing sites.
Top 8 Strategies for Effective Sustainable Waste Management.pdfJhon Wick
Discover top strategies for effective sustainable waste management, including product removal and product destruction. Learn how to reduce, reuse, recycle, compost, implement waste segregation, and explore innovative technologies for a greener future.
"Understanding the Carbon Cycle: Processes, Human Impacts, and Strategies for...MMariSelvam4
The carbon cycle is a critical component of Earth's environmental system, governing the movement and transformation of carbon through various reservoirs, including the atmosphere, oceans, soil, and living organisms. This complex cycle involves several key processes such as photosynthesis, respiration, decomposition, and carbon sequestration, each contributing to the regulation of carbon levels on the planet.
Human activities, particularly fossil fuel combustion and deforestation, have significantly altered the natural carbon cycle, leading to increased atmospheric carbon dioxide concentrations and driving climate change. Understanding the intricacies of the carbon cycle is essential for assessing the impacts of these changes and developing effective mitigation strategies.
By studying the carbon cycle, scientists can identify carbon sources and sinks, measure carbon fluxes, and predict future trends. This knowledge is crucial for crafting policies aimed at reducing carbon emissions, enhancing carbon storage, and promoting sustainable practices. The carbon cycle's interplay with climate systems, ecosystems, and human activities underscores its importance in maintaining a stable and healthy planet.
In-depth exploration of the carbon cycle reveals the delicate balance required to sustain life and the urgent need to address anthropogenic influences. Through research, education, and policy, we can work towards restoring equilibrium in the carbon cycle and ensuring a sustainable future for generations to come.
Improving the viability of probiotics by encapsulation methods for developmen...Open Access Research Paper
The popularity of functional foods among scientists and common people has been increasing day by day. Awareness and modernization make the consumer think better regarding food and nutrition. Now a day’s individual knows very well about the relation between food consumption and disease prevalence. Humans have a diversity of microbes in the gut that together form the gut microflora. Probiotics are the health-promoting live microbial cells improve host health through gut and brain connection and fighting against harmful bacteria. Bifidobacterium and Lactobacillus are the two bacterial genera which are considered to be probiotic. These good bacteria are facing challenges of viability. There are so many factors such as sensitivity to heat, pH, acidity, osmotic effect, mechanical shear, chemical components, freezing and storage time as well which affects the viability of probiotics in the dairy food matrix as well as in the gut. Multiple efforts have been done in the past and ongoing in present for these beneficial microbial population stability until their destination in the gut. One of a useful technique known as microencapsulation makes the probiotic effective in the diversified conditions and maintain these microbe’s community to the optimum level for achieving targeted benefits. Dairy products are found to be an ideal vehicle for probiotic incorporation. It has been seen that the encapsulated microbial cells show higher viability than the free cells in different processing and storage conditions as well as against bile salts in the gut. They make the food functional when incorporated, without affecting the product sensory characteristics.
Epcon is One of the World's leading Manufacturing Companies.EpconLP
Epcon is One of the World's leading Manufacturing Companies. With over 4000 installations worldwide, EPCON has been pioneering new techniques since 1977 that have become industry standards now. Founded in 1977, Epcon has grown from a one-man operation to a global leader in developing and manufacturing innovative air pollution control technology and industrial heating equipment.
different Modes of Insect Plant InteractionArchita Das
different modes of interaction between insects and plants including mutualism, commensalism, antagonism, Pairwise and diffuse coevolution, Plant defenses, how coevolution started
2. • Conductivity, k, is a measure of the ability of an aqueous solution to carry
an electric current
• This ability depends on the presence of ions; on their total concentration,
mobility, and valence; and on the temperature of measurement
• Solutions of most inorganic compounds are relatively good conductors.
Conversely, molecules of organic compounds that do not dissociate in
aqueous solution conduct a current very poorly
3. • Conductance, G, is defined as the reciprocal of resistance, R
• where the unit of R is ohm and G is ohm-1 (sometimes written mho).
• Conductance of a solution is measured between two spatially fixed
and chemically inert electrodes.
4. • To avoid polarization at the electrode surfaces the conductance
measurement is made with an alternating current signal
• The conductance of a solution, G, is directly proportional to the
electrode surface area, A, cm2 , and inversely proportional to the
distance between the electrodes, L, cm. The constant of
proportionality, k, such that is called “conductivity
5. • (k is preferred to “specific conductance”).It is a characteristic
property of the solution between the electrodes.
• The units of k are 1/ohm-cm or mho per centimeter.
• Conductivity is customarily reported in micromhos per centimeter
(µmho/cm).
6. • In the International System of Units (SI) the reciprocal of the ohm is
the siemens (S) and conductivity is reported as milli siemens per
meter (mS/m); 1 mS/m = 10 µmhos/cm and 1 µS/cm = 1 µmho/cm.
To report results in SI units of mS/m divide µmhos/cm by 10.
7. • To compare conductivities, values of k are reported relative to
electrodes with A = 1 cm2 and L = 1 cm.
• Absolute conductances, Gs, of standard potassium chloride solutions
between electrodes of precise geometry have been measured; the
corresponding standard conductivities, ks are shown in Table 2510:I.
8.
9. • The equivalent conductivity, Λ, of a solution is the conductivity per unit
of concentration. As the concentration is decreased toward zero, Λ
approaches a constant, designated as Λ°. With k in units of micromhos per
centimeter it is necessary to convert concentration to units of equivalents
per cubic centimeter; therefore:
• The equivalent conductivity, Λ, of a solution is the conductivity per unit of
concentration
10. • the units of Λ, k, and concentration are mho-cm2/ equivalent, µmho/cm,
and equivalent/L, respectively.
• Equivalent conductivity, Λ, values for several concentrations of KCl are
listed in Table 2510:I.
• In practice, solutions of KCl more dilute than 0.001M will not maintain
stable conductivities because of absorption of atmospheric CO2.
• Protect these dilute solutions from the atmosphere
11. Measurement
Instrumental measurements:
• In the laboratory, conductance, Gs, (or resistance) of a standard KCl
solution is measured and from the corresponding conductivity, ks,
(Table 2510:I) a cell constant, C, cm -1 , is calculated:
12. • Most conductivity meters do not display the actual solution
conductance, G, or resistance, R; rather, they generally have a dial
that permits the user to adjust the internal cell constant to match
the conductivity, ks, of a standard. Once the cell constant has been
determined, or set, the conductivity of an unknown solution
13. • Distilled water produced in a laboratory generally has a conductivity
in the range 0.5 to 3 mhos/cm. The conductivity increases shortly
after exposure to both air and the water container.
• Estimate total dissolved solids (mg/L) in a sample by multiplying
conductivity (in micromhos per centimeter) by an empirical factor.
This factor may vary from 0.55 to 0.9, depending on the soluble
components of the water and on the temperature of measurement.
14. • Relatively high factors may be required for saline or boiler waters, whereas lower
factors may apply where considerable hydroxide or free acid is present.
• Even though sample evaporation results in the change of bicarbonate to
carbonate the empirical factor is derived for a comparatively constant water
supply by dividing dissolved solids by conductivity
15. • the relative contribution of each cation and anion is calculated by
multiplying equivalent conductances mho-cm2 /equivalent, by
concentration in equivalents per liter and correcting units.
19. • calculate ionic strength, IS in molar units:
• Calculate the monovalent ion activity coefficient, y, using the Davies
equation for IS ≤ 0.5 M and for temperatures from 20 to 30°C
20. • In the present example IS 0.00767 M and y = 0.91. Finally, obtain the
calculated value of conductivity, kcalc, from:
• In the example being considered, kcalc = 578.2 x (0.91)2 478.8
µmho/cm versus the reported value as measured by the USGS of 477
µmho/cm
21. • If the calculated electrical conductivity (EC) is larger than the
measured EC value, re-analyze the higher anion or cation analysis
sum. If it is smaller, re-analyze the lower anion or cation analysis sum.
• Measured EC and Ion Sums
Both the anion and cation sums should be approximately 1/100 of the
measured EC value. If either sum does not meet this criterion, then it is
suspect; re-analyze the sample. The acceptable criteria are as follows
22. • Calculated TDS-to-EC Ratio
If the ratio of calculated TDS to conductivity is 0.55, then the lower ion sum
is suspect; re-analyze it. If the ratio is 0.7,then the higher anion or cation
analysis sum is suspect; reanalyze it. If the lower anion or cation analysis sum
does not change after re-analysis, a significant concentration of an
unmeasured constituent (e.g., ammonia or nitrite) may be present. If poorly
dissociated calcium and sulfate ions are present, then TDS may be as high as
0.8 times the EC. The acceptable criterion is as follows:
23.
24. • Measured TDS-to-EC Ratio
The measured TDS-to-EC ratio should be between 0.55 and 0.7. If it is
outside these limits, then either measured TDS or measured
conductivity is suspect; re-analyze.