Kinetics and Mechanism of the Oxidation of Ethylenediamine-N,N,N’,N’-tetraacetatocobaltate(II) Complex by Hypochlorite ion in Aqueous Nitric Acid Medium
Year: 2018
Type: article
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 (NaNO 3 ), [H + ] = 4 A— 10 -3 mol dm -3 , T = 300 ± 1 K and I» max = 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.
Language: English
Subfield: Inorganic Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W2903674738