Kinetics and mechanism of redox reactions in aqueous solution. Part 1. Silver(I)-catalysed oxidation of cerium(III) by peroxodisulphate ion

Abstract

The kinetics of the silver(I)-catalysed oxidation of Ce^III by [S₂O₈]^2– in 0.5 mol dm^–3 sulphuric acid have confirmed a zero-order dependence on [Ce^III] and a first-order dependence on [Ag^I]. However, the order with respect to [S₂O₈^2–] is less than one and the reaction is retarded by both hydrogen sulphate ions and sulphuric acid. The probable mechanism of the reaction is discussed.