Thermodynamics of aqueous aluminum: Standard partial molar heat capacities of Al 3+ from 10 to 55°C

Details Thermodynamics of aqueous aluminum: Standard partial molar heat capacities of Al 3+ from 10 to 55°C Thermodynamics of aqueous aluminum: Standard partial molar heat capacities of Al 3+ from 10 to 55°C

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50..453h&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 50, Issue 3, pp.453-459

Physics

2

Scientific paper

Apparent molar heat capacities and volumes of Al(NO 3 ) 3 and AlCl 3 have been measured at 25°C in dilute aqueous acid solutions to suppress hydrolysis. Heat capacity results for AlCl 3 span the range 10-55°C. The measurements yield standard partial molar heat capacities, o p , and volumes, o , for the Al 3+ (aq) ion: , , where T is the absolute temperature (K.). Our result for is consistent with published semi-empirical correlations. The result for is more negative than that predicted from the entropy correspondence principle by 135 J K -1 mol -1 and casts doubt upon the correspondence method as a predictive tool. The heat capacities approach Born behaviour at elevated temperatures and appear to be consistent with the Helgeson-Kirkham-Flowers model ( et al. , (1981) Amer. J. Sci. 281 , 1249-1516) for extrapolations to higher temperatures.

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