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Variation of Conductivity with dilution - Electrochemistry Video Lecture | Physical Chemistry

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FAQs on Variation of Conductivity with dilution - Electrochemistry Video Lecture - Physical Chemistry

1. What is conductivity and how does it vary with dilution?
Ans. Conductivity is a measure of a solution's ability to conduct electricity. It depends on the concentration of ions in the solution. When a solution is diluted, the concentration of ions decreases, resulting in a decrease in conductivity. This is because fewer ions are available to carry the electrical charge.
2. How can we determine the conductivity of a solution?
Ans. The conductivity of a solution can be determined using a conductivity meter or conductivity probe. These devices measure the electrical conductance of the solution, which is then used to calculate the conductivity. The conductance is measured by applying a small alternating current to the solution and measuring the resulting voltage drop.
3. Why is conductivity important in electrochemistry?
Ans. Conductivity is important in electrochemistry because it provides information about the movement of ions in a solution. Electrochemical reactions involve the transfer of ions between electrodes, and conductivity helps in understanding the rate at which these ions move. It also helps in determining the concentration of ions in a solution, which is crucial for calculating reaction kinetics and understanding the behavior of electrochemical cells.
4. How does dilution affect the conductivity of electrolytes?
Ans. Dilution of electrolytes decreases their conductivity. This is because dilution reduces the concentration of ions in the solution, which are responsible for carrying electrical charge. As the concentration of ions decreases, there are fewer particles available to carry the current, resulting in a decrease in conductivity. The relationship between conductivity and dilution is generally linear, with conductivity decreasing as the solution becomes more dilute.
5. Can you provide an example of how conductivity varies with dilution?
Ans. Sure! Let's consider a solution of sodium chloride (NaCl) in water. Initially, the solution has a high conductivity due to the presence of a high concentration of sodium and chloride ions. As we gradually dilute the solution by adding more water, the conductivity decreases. This is because the concentration of sodium and chloride ions decreases with dilution. The conductivity will continue to decrease until the solution becomes highly dilute, where the conductivity approaches the conductivity of pure water, which is much lower.
83 videos|142 docs|67 tests
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