Kinetic Approach to the Mechanism of the Redox Reaction of Ethylenediaminetetraacetatoferrate(III) Complex and Thioglycolic Acid in Bicarbonate Buffer Medium

Nkole Ikechukwu Ugbaga, David Ameh Onu, Chinedu Romanus Osunkwo, Suleiman Ola Idris

Abstract


The kinetic approach of the reduction of by an ethylenediaminetetraacetatoferrate(III) complex (hereafter [Fe(III)EDTA]-) by thioglycolic acid (hereafter TSH) in bicarbonate buffer medium have been studied under the following conditions: T = 28 ± 1oC, Ionic Strength, I = 0.2 mol dm-3 (KNO3), pH = 7.5 and λmax = 470 nm . The ratio from the stoichiometric study conforms to the equation 2[Fe(III)EDTA]- + 2TSH → 2[Fe(II)EDTA]2- + TSST + 2H+. The reaction rate varied linearly to the first power of the concentrations of the oxidant and reductant and displayed dependence on pH of the reaction medium. The reaction was sensitive to the change in ionic strength of the medium suggesting an interaction of charged species at the activated complex. The Michaelis-Menten plot of 1/kobs versus 1/[TSH] was linear with zero intercepts which suggested an absence of intermediate complex.

Pieces of evidences in this paper showed that the reaction occurred via the outer-sphere mechanism.


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