Electrochemical Studies of Bi(III) Complexes with Bicarboxylic Acids by Deford and Hume’s and Mihailov’s Methods

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The reduction of Bi(III) with Bicarboxylic acids(Malonic acid and Adipic acid)is investigated electrochemically in aqueous media at the temperatures 304K and 314K at dropping mercury electrode. The constant ionic strength (μ=1M) has been maintained using KNO3 as a supporting electrolyte. The reduction of the system in each case is quasireversible and diffusion controlled, involving three electrons. Bi(III) shows 1:1 ,1:2 and 1:3 complexes with these ligands. Gelling’s method was used to calculate Er1/2 values for Bi(III) complexes. Thermodynamic parameters DG°, DH° and DS° were also calculated for the systems. The stability constants of Bi(III) with bicarboxylic acids were calculated by DeFord & Hume method, and have been verified by Mihailov’s mathematical approach.

Bi(III); Malonic acid; Adipic acid; polarographic study; quasireversible; dropping mercury electrode