Collect. Czech. Chem. Commun. 1981, 46, 1229-1236

Kinetics of hydrolysis of peroxodisulphate ions in acidic medium to peroxomonosulphuric acid

Jan Balej and Milada Thumová

Institute of Inorganic Chemistry, Czechoslovak Academy of Sciences, 160 00 Prague 6


The rate of hydrolysis of S2O82- ions in acidic medium to peroxomonosulphuric acid was measured at 20 and 30 °C. The composition of the starting solution corresponded to the anolyte flowing out from an electrolyser for production of this acid or its ammonium salt at various degrees of conversion and starting molar ratios of sulphuric acid to ammonium sulphate. The measured data served to calculate the rate constants at both temperatures on the basis of the earlier proposed mechanism of the hydrolysis, and their dependence on the ionic strength was studied.