Standard potential of the silver-silver chloride electrode in 10, 20, and 40 wt.% ethanol/water solvents at 25, 0, ?5, and ?10�C

Abstract

In order to facilitate the measurement of thermodynamic quantities at temperatures below 0°C in ethanol/water solvents, the standard potential of the silver-silver chloride electrode in 10, 20, and 40 wt.% ethanol has been determined at 25, 0, −5, and −10°C. Electromotive force measurements of cells of the type $$Pt;H_2 (g)|HCl(m) in EtOH/H_2 O|AgCl;Ag$$ were used. The potentials found at 25°C were in good agreement with earlier results. Mean activity coefficients for hydrochloric acid in the three mixed solvents were derived.