Kinetics of Oxidation of Iodide Ion by Ce(IV)

Abstract

Kinetics of oxidation of iodide ion by Ce(IV) was studied. The reactions

are found to be of 1.5 order in case of iodide, first order in Ce(IV) and

first order in case of [H⁺] in the case of uncatalysed reaction. In the case

of catalysed reactions both by Ru(III) and Os(VIII) it was noticed that the

order with respect to iodide is 1.5, the order with respect to Ce(IV) is one

and the dependence on hydrogen ion is found to be one while the reactions

are found to be first order in case of both the catalysts Ru(III) and Os(VIII).

Plausible mechanisms have been postulated both in the case of uncatalysed

and catalysed reactions based upon the experimental observations.