The polarographic determination of stability constants of metal complexes of In(III) with 2-2´ Oxydiacetic acid under varying temperatures, at 300K and 310K and in various aqueous and aqueous non-aqueous media, have shown the formation of 1:1 and 1:2 complexes. The values of overall stability constants of complexes have been calculated by DeFord and Hume's method which is further verified by Mihailov's method. The reduction process was found to be reversible and diffusion controlled involving three electron transfer. The change in thermodynamic parameters DG°, DH°, and DS° accompanying complexation have been also evaluated. It was found that the stability constants of In(III)-2,2´-Oxydiacetic acid system in aqueous non-aqueous medium are greater than in aqueous medium.
Ke words : Electrochemical, polarography, dropping mercury electrode, effect of temperature, 2,2´-Oxydiacetic acid, In(III), Mihailov's method and DeFord and Hume's method.