Thermodynamics of aqueous zinc: Standard partial molar heat capacities and volumes of Zn 2+ (aq) from 10 to 55°C

Details Thermodynamics of aqueous zinc: Standard partial molar heat capacities and volumes of Zn 2+ (aq) from 10 to 55°C Thermodynamics of aqueous zinc: Standard partial molar heat capacities and volumes of Zn 2+ (aq) from 10 to 55°C

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58.4867p&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 58, Issue 22, pp.4867-4874

Physics

Scientific paper

The apparent molar heat capacities and volumes of aqueous Zn(ClO 4 ) 2 have been measured from 10-55°C in a Picker flow microcalorimeter and vibrating tube densimeter. The Guggenheim form of the extended Debye-Hückel equation was fitted to the experimental data, to obtain the following expressions for the standard-state properties from 10-55°C: (1) and . (2) The standard partial molar heat capacities and volumes for Zn 2+ (aq) were extrapolated to higher temperatures by employing the Helgeson-Kirkham-Flowers (HKF) equations, amended to include a standardstate correction term. Gibbs energies calculated from the extrapolated heat capacity and volume functions are consistent with limited experimental data for the solubility of ZnO in acidic to near-neutral aqueous solutions at 200-300°C ( and , 1987).

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