An analytical and kinetic study of the periodate oxidation of vanadium(IV) in acidic medium

Abstract

The kinetics of the reaction between sodium periodate and vanadium(IV) have been studied in 5 M perchloric acid and at 5·54 M ionic strength. Under these conditions, the reaction was found to obey the rate equation [graphic omitted] Values of k_o of 0·27 1 mol^–1 s^–1 and K_-1 of 2·24 1 mol^–1 were obtained at 16 °C and the activation energy was 18·4 ± 1 kcal mol^–1. The reaction rate is also inversely proportional to the hydrogen-ion concentration and a possible mechanism is proposed that satisfies the experimental results.

A procedure for the determination of vanadium(IV) by spectrophotometric titration with periodate is described and is compared with other oxidimetric methods for the determination of vanadium(IV).