Abstract

A spectrophotometric investigation of silver(II) in phosphoric acid solution has revealed the presence of two predominant silver(II) phosphate complexes, which undergo reduction by water according to a rate law second order in silver(II), inverse first order in silver(I) and complex in solvent anion and hydrogen ion concentrations. A comparison of trends in molar absorptivities and pseudo-first order rate constants indicates that the reduction step is preceded by rapid equilibria involving silver(II) complexes. A single oxidation-reduction mechanism seems to be common to the three acidic media studied to date.

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