ELECTROCHEMICAL REDUCTION OF SILVER THIOSULFATE COMPLEXES .1. THERMODYNAMIC ASPECTS OF SOLUTION COMPOSITION

Citation
A. Hubin et J. Vereecken, ELECTROCHEMICAL REDUCTION OF SILVER THIOSULFATE COMPLEXES .1. THERMODYNAMIC ASPECTS OF SOLUTION COMPOSITION, Journal of Applied Electrochemistry, 24(3), 1994, pp. 239-244
Citations number
12
Categorie Soggetti
Electrochemistry
ISSN journal
0021891X
Volume
24
Issue
3
Year of publication
1994
Pages
239 - 244
Database
ISI
SICI code
0021-891X(1994)24:3<239:EROSTC>2.0.ZU;2-B
Abstract
Deposition of silver from electrolyte solutions is of major importance in the industrial applications of photographic development and electr oplating. Prior to the kinetic study of the reduction of silver thiosu lphate complexes, the concentrations, activities and activity coeffici ents of all components formed in AgNO3-Na2S2O3-NaNO3 solutions are cal culated, starting from the measurement of the equilibrium potential. I n view of the high ionic strength of the solutions (greater than 0.1 m ol kg-1), the ion interaction model is applied for the estimation of t he activity coefficients, inevitably imposing the use of an iterative calculation routine. The activity coefficients are shown to comply wit h known thermodynamic laws, supporting the appropriateness of the mode l, together with the approximations.