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Molar Volumes and Heat Capacities of Aqueous Solutions of Mg(ClO4)2
Journal article   Peer reviewed

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

R. Caro, L. Hnědkovský, J.M. del Río and G. Hefter
Journal of Chemical & Engineering Data, Vol.65(7), pp.3735-3743
2020
DOI: https://doi.org/10.1021/acs.jced.0c00358
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Abstract

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.

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Citation topics
2 Chemistry
2.89 Ionic, Molecular & Complex Liquids
2.89.462 Excess Molar Volumes
Web Of Science research areas
Chemistry, Multidisciplinary
Engineering, Chemical
Thermodynamics
ESI research areas
Chemistry
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