Thermodynamic Properties of Compounds
in the PdOH₂O System at 25C

N. A. Polotnyanko^a and I. L. Khodakovskii^a,b†

^aDubna International University of Nature, Society, and Man, ul. Universitetskaya 19, Dubna, Moscow oblast, 141980 Russia

e-mail: polot.nat@gmail.com

^bVernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences,
ul. Kosygina 19, Moscow, 11991 Russia

Received July 12, 2012; in final form, February 12, 2013

Abstract—Literature thermodynamic data on species and particles existing in the heterogeneous PdO–H₂O
system were checked for consistency, and the equilibrium constants for dissolution of palladium oxide and
hydroxide in water and for Pd²⁺ (aq) hydrolysis were recommended.
obtained in this work for Pd²⁺(aq) sharply differs (no less than by 6 kJ/mol) from values that are
reported in fundamental thermodynamic reference books and based on experimentally measured palladium
electrode potential at 25C. Detailed examination of literature data on the thermodynamic properties of com-
pounds in the Cl–Pd(aq) system is required to account for revealed inconsistency.

Keywords: thermodynamics, palladium oxide, solubility, palladium ion

DOI: 10.1134/S0016702913110074

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