Studies On The Hydrolysis Of Metal Ions Part 34 The Hydrolysis Of The Indiumiiiion In3 In 3 M Na Cl Medium

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).

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The hydrolysis equilibria of the La(III) ion have been studied at 25C by hydrogen ion concentration measurements, using a glass electrode. The total (La(III)) was varied between 0.1 and 1.0 M, whilst the concentration of the ClO4- ion was held constant at 3 M by the addition of LiClO4. The experimental conditions necessary for accurate results to be obtained, when the hydrolysis equilibria must be studied in poorly buffered solutions, are discussed in some detail.

The composition of the argentate(I) complex formed in alkaline solutions of silver oxide has been studied by emf titrations with constant ionic medium (0.95 and 12.6 M NaOH, 1.15 and 11.5 M KOH) using Ag-AgI electrodes. The data indicate that only mononuclear complexes are formed; from this result, together with the solubility data of other workers, it is concluded that the formula of the complex is Ag(OH)2( - ). No evidence has been found for the presence of the polynuclear argentate complexes proposed by some previous workers. The solubility product of Ag2O(s) in 3 M Na(ClO4) at 25C was determined as log K(sO) = log (Ag(+) conc.)(OH( - ) conc.) = -7.42 AG(OH)2( - ). (Author).