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Kinetic Approach to the Reduction of Ethylenediaminetetraacetatoferrate(III) Complex by Iodide Ion in Aqueous Acidic Medium

I. U. Nkole, C. R. Osunkwo

Asian Journal of Physical and Chemical Sciences · pp. 1–8 · Published 28 Aug 2019

10.9734/ajopacs/2019/v7i230091

Abstract

The kinetic approach to the reduction of ethylenediaminetetraacetatoferrate(III) complex (hereafter [Fe(III)EDTA]-) by iodide ion has been studied spectrophotometrically in an aqueous acidic medium. The study was carried out under pseudo-first order conditions of an excess of iodide ion concentration at 28 ± 1, ionic strength (I) = 0.43 coulomb2 mol dm-3 (KNO3) and [H+] = 5.0  10-2 mol dm-3. The [Fe(III)EDTA]- complex was reduced according to the reaction; 2[Fe(III)EDTA]- + 2I-  → 2[Fe(II)EDTA]2- + I2 The rate law is - d[Fe(III)EDTA-]/dt = (a + b[H+])[Fe(III)EDTA-][I-] The rate of the reaction is first order in oxidant and reductant concentrations, and displayed positive Brønsted-Debye salt effect. On the basis of catalysis by added cation, Michaelis-Menten plots and the absence of intermediates, the outer-sphere electron transfer mechanism is proposed for the reaction.

Kinetics mechanism iodide reduction ethylenediaminetetraacetatoferrate(III) complex.

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