Measurement of resistance of a solution of an electrolyte
- l/A is called cell constant denoted by the symbol, G’.
- The cell constant depends on the distance between the electrodes (l) and their area of cross-section (A).
- It is determined by measuringthe resistance of the cell containing a solution of known conductivity.
The resistance of a conductivity cell containing 0.001M KCl solution at 298 K is 1500 Ω. What is the cell constant if conductivity of 0.001M KCl solution at 298 K is 0.146 x 10-3 S cm-1.
Conductivity, k = 0.146 × 10 - 3 S cm - 1
Resistance, R = 1500 Ω
Cell constant = k × R = 0.146 × 10 - 3 × 1500 = 0.219 cm - 1