Class 12 Chemistry Electrochemistry Measurement of resistance of a solution

Measurement of resistance of a solution of an electrolyte

  • In the formula

  • 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.

Problem:

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.

Solution:

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

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