Abstract
A quantitative treatment of oxo-acidity reactions, particularly the solubilization of metal oxides in two low-melting salts — ethylammonium chloride and ethylpyridinium bromide — is described, with the aid of experimental results obtained previously. An “oxo-acidity function”, Ω, is defined, allowing the quantitative classification of oxo-acid/oxo-base strengths in these molten media. The influence of the Brønsted acidity properties (characterized by pH in the fused salts) on the oxo-acidity phenomena is then discussed. A Ω/pH relation is established, the partial pressure of water vapor being introduced. In this way, quantitative estimates of oxo-acidity reactions caused by the action of acids or bases become possible when the moisture content of the fused salts is controlled. The influence of these phenomena on oxidation—reduction properties is also considered, by means of equilibrium potential/Ω diagrams. Their practical exploitation is discussed.
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