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Pharmaceutical Physical Chemistry: Theory and Practices by S. K. Bhasin

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Experiment 5

OBJECT

Determination of the cell constant at different concentrations and infer the results obtained.

THEORY

Cell Constant

If R is the resistance of a solution measured by a cell with electrodes of cross-sectional area a cm2 and l cm apart, the specific conductivity of the solution is given by,

 

images

 

where images is the cell constant.

The cell constant, i.e., the ratio l/a, cannot be obtained from the geometrical dimensions of the cell, as both l and a, they are not accurately known. It is, therefore, necessary to calibrate the cell with ...

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