The Activity Coefficient of Copper Sulphate in Aqueous Solution

The electromotive force of the cell Cu two phase amalgam/CuSO₄/Hg₂SO₄, Hg has been measured with solutions whose concentrations vary from 0.02 molal to saturation, and for temperatures from 15°C to 45°C. From these measurements and from freezing point and calorimetric heat of dilution data, activity coefficients have been calculated, and the value of E° for the cell has been determined. The results are in reasonable agreement with those of Nielsen and Brown and of Getman, but are in definite disagreement with the results of Lebettre.