STUDIES ON THE HYDROLYSIS OF METAL IONS. PART 34. THE HYDROLYSIS OF THE INDIUM(III)ION, IN(3+), IN 3 M (NA(+)) CL (-)MEDIUM,

Abstract : The hydrolysis equilibria of In(III) were studied at 25C in the ionic medium 3 M(Na(+)Cl(-) by measuring the hydrogen ion concentration with a glass electrode. The (In(III)) ranged from 0.001 to 0.04 M, and the hydrogen ion concentration was varied from values high enough for the hydrolysis to be negligible to those low enough for a precipitate to be formed. Comparison with the equilibrium constants for the formation of the species InOH(2+) and In(OH)2(4+) in 3 M(Na(+))Cl4(-) indicates that in 3 M (Na(+)Cl(-) medium the species denoted by the collective formulas 'InOH(2+)' and In(OH)2(4+) are in reality mainly mixed Cl(-)-OH(-) complexes (just as 'In(3+)' denotes mainly Cl(-) complexes). (Author)