Kinetics and mechanism of oxidation of iodide by diperiodatoargentate(III)

Abstract

The kinetics of oxidation of iodide by diperiodatoargentate(III) has been investigated in alkaline medium. The reaction is found to be first order in oxidant inverse first order in alkali and fractional order in periodate. The order in substrate is nearly one at low concentrations and increases beyond unity at its higher concentrations. The rate of the reaction is found to be unaffected by added excess of iodine or by the ionic strength of the medium. The activation parameters for the overall reaction have been obtained and a mechanism involving an intermediate between iodide and a protonated and undissociated diperiodatoargentate(III) species has been proposed.