Studies on the Hydrolysis of Metal Ions. Potentiometric Study of the Argentate(I) Complex in Alkaline Solution

摘要

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)