Kinetics and Mechanism of the Oxidation of Ethylenediamine-N,N,N’,N’-tetraacetatocobaltate(II) Complex by Hypochlorite ion in Aqueous Nitric Acid Medium

Y. Ahmed, A. D. Onu, S. O. Idris, S. S. Iliyasu, Y. B. Abiti, U. Bello

Abstract


The kinetics of the oxidation of ethylenediamine-N,N,N’,N’-tetraacetatocobaltate(II) (hereafter, [Co(II)EDTA]2-) complex by hypochlorite ion in aqueous nitric acid medium have been studied at I = 0.5 mol dm-3(NaNO3), [H+] = 4 × 10-3 mol dm-3, T = 300 ± 1 K and λmax = 520 nm. Stoichiometry of 1:1 of the reaction is reported. The rate law derived from the kinetic study under pseudo first order condition is . The rate constant of reaction,  varies inversely with acid concentration, [H+] within the investigated concentration range. Thus, the overall rate law is  . The reaction displayed positive salt effect which suggests the activated complex was made up of similar charged species. The reaction was catalysed by addition of both formate, HCOO-and lithium, Li+ ions and the Michaelis-Menten’s plot gave zero intercept indicating the absence of binuclear intermediate complex during the course of the reaction. A reaction mechanism via an outer-sphere pathway is proposed for this reaction.


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