The Measurment of Conductivity

The Measurment of Conductivity

:To measure the conductivity of a solution it is placed in a cell of which the cell constant has been determined by calibration with a solution accurately known conductivity(KCl) .the cell is placed in one arm of a wheatstone bridge circuit.
The passage of a current through a solution of an electrolyte may produce changes in the composition of solution in the vicinity of the electrodes:with the consequent introduction of serious errors in the conductivity measurements,unless such polarization effects can be reduced to negligible proportions .These difficulties are overcome by the use of alternating currents for the measurements so that the extent of electrolysis and the polarization effects are reduced.
Conductometric titrations carried out with current of low frequency and titratins carried out using current at high frequencies in these cases we measure changes in capacitance or in inductance rather than in conductance,and such titrations are therefore usually referred to as high frequency titration