Thermodynamic properties of Pd chloride complexes and the Pd super(2+)(aq) ion in aqueous solutions

Based on the expert review of literature data on the thermodynamic properties of species in the Cl-Pd system, stepwise and overall stability constants are recommended for species of the composition [PdCl sub(n)] super(2 - n), and the standard electrode potential of the half-cell PdCl sub(4) super(2-...

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Bibliographic Details
Published in:Geochemistry international 2014-01, Vol.52 (1), p.46-56
Main Authors: Polotnyanko, NA, Khodakovskii, IL
Format: Article
Language:English
Subjects:
Aqueous solutions
Calorimetry
Chlorides
Electrode potentials
Geochemistry
Stability constants
Thermodynamic properties
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Summary:Based on the expert review of literature data on the thermodynamic properties of species in the Cl-Pd system, stepwise and overall stability constants are recommended for species of the composition [PdCl sub(n)] super(2 - n), and the standard electrode potential of the half-cell PdCl sub(4) super(2-)/Pd(c) is evaluated at E sub(298,15) degree = 0.646 plus or minus 0.007 V, which corresponds to Delta sub(f) G sub(298.15) degree = -400.4 plus or minus 1.4 kJ/mol for the ion PdCl sub(4) super(2-)(aq). Derived from calorimetric data, Delta sub(f) H sub(298.15) degree PdCl sub(4) super(2-)(aq) = -524.6 plus or minus 1.6 kJ/mol and Delta sub(f) H sub(298.15) degree Pd super(2+)(aq) = 189.7 plus or minus 2.6 kJ/mol. The assumed values of the overall stability constant of the PdCl sub(4) super(2-)ion and the standard electrode potential of the PdCl sub(4) super(2-)/Pd(c) half-cell correspond to Delta sub(f) G sub(298.15) degree = 190.1 plus or minus 1.4 kJ/mol and S sub(298.15) degree = -94.2 plus or minus 10 J/(mol K) for the Pd super(2+)(aq) ion.
ISSN:0016-7029
1556-1968
DOI:10.1134/S0016702914010054