Thermodynamic properties of copper sulphate in dioxan + water mixtures from electromotive-force measurements

Abstract

Electromotive-force measurements of the cell Cu-Hg|CuSO₄(m), dioxan (X)|Hg₂SO₄(s)|Hg have been made at 288, 298, 308 and 318 K for solvent compositions X= 10, 20, 30 and 40%(w/w) of dioxan. These have been used to evaluate the standard potentials of the cell, the mean activity coefficient of copper sulphate (molal scale) and the thermodynamic functions of transfer of copper sulphate from water to the respective dioxan + water media. The results have been interpreted in terms of solute–solvent interactions.