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Standard XII

Chemistry

Equivalent, Molar Conductivity and Cell Constant

The cell cons...

Question

The cell constant of a conductivity cell:

changes with change of electrolyte

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remains constant for a cell

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changes with temperature electrolyte

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changes with change of concentration of electrolyte

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Solution

The correct option is A remains constant for a cell
The cell constant, K, is equal to the distance in cm between the probe's electrodes divided by the surface area of the electrodes in $c m^{2}$ .

For solutions with low conductivities, the electrodes can be placed closer together or made larger so that the cell constant is less than one.

For a particular conductivity cell, the cell constant remains the same even if-

The electrolyte is changed.
The concentration of the electrolyte is changed.
The temperature of electrolyte is changed.

Hence, option B is correct.

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