Liquid Junction Potential - Calculation

Calculation

The liquid junction potential can not be measured directly but calculated. The Electromotive force (EMF) of a concentration cell with transference includes the liquid junction potential.

Ewithout transference = RT/F . ln(a2/a1)

where a1 and a2 are activities of HCl in the two solutions, R is the Universal Gas Constant, T is the temperature and F is Faraday's Constant.

Ewith transference = tM RT/F . ln (a2/a1)

where a2 and a1 are activities of HCl solutions of right and left hand electrodes respectively and tM be transport number of Cl–

Liquid Junction potential = Ewith transference– Ewithout transference = (tM – 1) RT/F . ln (a2/a1)


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