Abstract
The volta potential difference method at 298.15 K was used to determine the real primary medium effect for magnesium, calcium, cadmium, and copper ions, and also the real Gibbs transfer energy of these ions from water into a mixed water ethanol (EtOH) solution. The surface potential value at the nonaqueous solution/gas phase interface \( \Delta \chi _{H_2 O}^{EtOH} \) was obtained. With account for this value, chemical thermodynamic characteristics of the studied ions in the water-ethanol solvent were calculated and the effect of composition and nature of the mixed solvent on the values obtained was analyzed. The dependence of variation in the thermodynamic characteristics of cation resolvation was established on their crystallographic radius that corresponds to the following sequence: Ca2+ < Cd2+ < Cu2+ < Mg2+.
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Original Russian Text © T.I. Chankina, V.I. Parfenyuk, 2010, published in Elektrokhimiya, 2010, Vol. 46, No. 9, pp. 1058–1063.
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Chankina, T.I., Parfenyuk, V.I. Thermodynamics of resolvation of Mg2+, Ca2+, Cd2+, and Cu2+ ions in aqueous-ethanol mixtures on the basis of volta potential difference method. Russ J Electrochem 46, 993–998 (2010). https://doi.org/10.1134/S1023193510090041
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DOI: https://doi.org/10.1134/S1023193510090041