Ruthenium redox equilibria: 1. Thermodynamic stability of Ru(III) and Ru(IV) hydroxides

Author:

Povar Igor,Spinu Oxana

Abstract

<p class="PaperKeywordTitle"><span lang="EN-US">On the basis of the selected thermodynamic data for Ru(III) and Ru(IV) compounds in addition to original thermodynamic and graphical approach used in this paper, the thermodynamic stability areas of sparingly soluble hydroxides as well as the repartition of their soluble and insoluble chemical species towards the solution pH and initial concentrations of ruthenium in heterogeneous mixture solid phase–saturated solution have been investigated. By means of the Δ<em>G</em>–pH diagrams, the areas of thermodynamic stability of Ru(III) and Ru(IV) hydroxides have been established for a number of analytical concentrations in heterogeneous mixtures. The diagrams of heterogeneous and homogeneous chemical equilibria have been used for graphical representation of complex equilibria in aqueous solutions containing Ru(III) and Ru(IV). The obtained results, based on the thermodynamic analysis and graphic design of the calculated data in the form of the diagrams of heterogeneous chemical equilibria, are in good agre­ement with the available experimental data. </span></p>

Publisher

International Association of Physical Chemists (IAPC)

Subject

Electrochemistry,Materials Chemistry,Colloid and Surface Chemistry,Chemical Engineering (miscellaneous)

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