Mercury-mercurous propionate electrode: standard potentials at different temperatures and related thermodynamic quantities

Abstract

The standard molal potentials E° m of the Hg/Hg 2(OPr) 2, OPr − electrode at 15°, 20°, 25°, 30° and 35° C have been determined. The E° m values obtained are 0.5114, 0.5072, 0.5031, 0.4988 and 0.4942 V respectively, which can be fitted to the equation Edg m/V = 0.5031 −8.56 × 10 −4 (itt/°C − 25)−3.0588 × 10 −6 ( t/ °C -25) 2. The changes in standard free energy, entropy and enthalpy for the cell reaction have been calculated.