Kinetics of oxidation of aquairon(2+) by iodate in dilute perchloric acid solution

Abstract

The kinetics of oxidation of aquairon(2+) by iodate in dilute perchloric acid have been studied at 35 °C in the presence of allyl alcohol, thus avoiding catalysis by the molecular iodine normally formed in this reaction. Overall, the reaction is 4Fe²⁺+ IO₃^–→ 4Fe³⁺+ I^I, followed by rapid removal of I^I by its reaction with allyl alcohol. The kinetic equation is –d[Fe²⁺]/dt= 4k₁(k₂+k₃[Fe²⁺])[Fe²⁺][IO₃^–]/(k_–1+k₂+k₃[Fe²⁺]). Aspects of the reaction mechanism are discussed.