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Studies on Thermodynamic Properties of Polyvalent Electrolytes from E. M. F. Measurements. III. The Silver‐Silver Tungstate Electrode
Author(s) -
Pan Kuan
Publication year - 1954
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.195400003
Subject(s) - tungstate , chemistry , molality , solubility equilibrium , extrapolation , tungsten , solubility , image (mathematics) , atmospheric temperature range , electrolyte , analytical chemistry (journal) , electrode , inorganic chemistry , thermodynamics , aqueous solution , physics , mathematical analysis , mathematics , organic chemistry , chromatography , artificial intelligence , computer science
(1) The solubility‐product of silver tungstate was evaluated from e.m.f. of the cell,by extrapolation of the function,to x=0, and then to m=0. The solubility‐product constants in the temperature range of 20° to 40°C are expressed by(2) The molal heat of solution of silver tungstate was evaluated from the temperature coefficients of 1n Ks.p. and given by(3) Standard potentials of the Ag; Ag 2 WO 4 (s), WO 4 − electrode were evaluated from π° Ag;Ag+ ‐ K log Ks.p. It givesover this temperature range. (4) The molal free energy change for the solution of silver tungstate is given by(5) Thermodynamic Data for the formation of silver tungstate from its elements at 25°C were evaluated as follows:(6) Standard potentials of the following cells,andwere obtained by the combination of standard potentials ofandelectrodes evaluated in my previous and present investigations. It givesfor Cell (IIa), (IIb) and (IIe), respectively. (7) Thermodynamic Calculations for the exchange reactions,for reactions (iv), (v) and (vi), respectively.