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Kohlrausch Law

why does cond...

Question

why does conductivity decrease with dilution.

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Solution

The conductivity of a solution is the conductance of ions present in a unit volume of the solution. The number of ions which are responsible for carrying current decreases when the solution is diluted. As a result, the conductivity of a solution decreases upon dilution.

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Q. Assertion :The ratio of specific conductivity to the observed conductance does not depend upon the concentration of the solution taken in the conductivity cell. Reason: Specific conductivity decreases with dilution whereas observed conductance increases with dilution.

Q. Assertion :Conductivity of weak electrolytic solution decreases with dilution whereas equivalent conductivity, molar conductivity increases with dilution. Reason: On dilution, the ionic mobility and number of ions present in solution increases but the number of ions per mL decreases.

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