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Molar Volumes and Heat Capacities of Aqueous Solutions of Mg(ClO4)2

Caro, R., Hnědkovský, L., del Río, J.M. and Hefter, G. (2020) Molar Volumes and Heat Capacities of Aqueous Solutions of Mg(ClO4)2. Journal of Chemical & Engineering Data, 65 (7). pp. 3735-3743.

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Densities and isobaric heat capacities of about 25 aqueous solutions of magnesium perchlorate, Mg(ClO4)2(aq), have been measured at concentrations 0.01 ≲ m/mol·kg–1 ≲ 2.5 using vibrating tube densimetry and flow calorimetry, respectively. Densities were determined at temperatures from 293.15 to 343.15 at 5 K intervals, but heat capacities were restricted to 298.15 K. These data were used to calculate the corresponding apparent molar volumes, Vϕ, and isobaric heat capacities, Cpϕ, which were extrapolated to infinite dilution using appropriate semi-empirical equations to give the standard-state values, V° and Cp°. Where comparisons were possible, the present results are in good agreement with literature data but are more extensive and precise. Standard values for Mg2+(aq) were obtained using appropriate extrathermodynamic assumptions and also agreed well with literature estimates. Unlike many inorganic salts, the V° values for Mg(ClO4)2(aq) do not show a maximum over the investigated temperature range.

Item Type: Journal Article
Murdoch Affiliation(s): Chemistry and Physics
Publisher: American Chemical Society
Copyright: © 2020 American Chemical Society
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