The kinetics of the oxidation of disodium 3, 3’-dioxobi-indolin-2, 2’-ylidene-5, 5’ disulphonate by heptaoxodichromate(VI)  ion in aqueous acidic medium 

By J .N. Edokpayi, J. F Iyun, S. O. Idris 

ABSTRACT 

The kinetics of the oxidation of disodium 3, 3’-dioxobi-indolin-2, 2’-ylidene-5, 5’ disulphonate (IC) by heptaoxodichromate(VI)  ion in aqueous acid medium has been studied at 25±10C, I = 0.5 mol dm-3(NaCl). The reaction is first order in [IC] and [Cr2O72-] and a stoichiometric mole ratio of IC: Cr2O72- is 1:1. Variations in ionic strength and added cations did not affect the reaction rate of the reaction. The experiment rate law obtained is: 

-d[IC]/ dt = k[Cr2O72-][IC][H+]. 

A plausible mechanism has been proposed on the basis of our experimental results. 

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