Mechanism and thermodynamics of the polarographic deposition of aquo in (III)

Abstract

The electroactive species responsible for polarographically reversible electro-deposition of aquo In(III) from noncomplexing electrolyte is identified as in(OH) 2 2+ formed by loss of 2 protons from aquo In(III). The ability of coordinated hydroxide ion to facilitate electrodeposition is attributed primarily to its ability to increase the ease of dehydration of the aquo metal ion. The value of the reversible half-wave potential for deposition of aquo In(II) is established and used to correct inherent inconsistencies in polarographically-measured stability constants of aquo In(III).