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Study of Reduction of In (III) with Pentanedioic Acid and 2- (Carbamimidoylmethylamino) Ethanoic Acid at Dropping Mercury Electrode

Sunita Sharma, Arvind Sharma and O. D. Gupta

The study of reduction of In (III) in aqueous solution with pentanedioic acid and 2- (carbamimidoylmethylamino)ethanoic acid was carried out at dropping mercury electrode under varying temperatures at 300 K and 310 K. The constant ionic strength (µ = 1M) has been maintained by using KNO3 as supporting electrolyte and Triton X-100 was used as maximum suppressor. The stability constants of In (III) with pentanedioic acid and 2-(carbaamimidoylmethylamino)ethanoic acid was evaluated first by DeFord and Hume's method while the stability constants of mixed complexes have been evaluated by the method of Schaap and McMasters. The reduction is found to be reversible and diffusion controlled involving three electrons in each case. The three species of mixed complexes MXY, MX2Y and MXY2 have been determined and found to be more stable than that of the simple ones. With the help of these data, the statistical and electrostatic effects have been also studied.