A thermochemical study of monohydrocalcite

Details A thermochemical study of monohydrocalcite A thermochemical study of monohydrocalcite

Mar 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973gecoa..37..685h&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 37, Issue 3, pp.685-694

Physics

7

Scientific paper

The thermodynamic properties of monohydrocalcite, CaCO 3 · H 2 O, have been obtained using a well-characterized natural specimen. Equilibration of the solid with water at 25°C under 0.97 atm CO 2 led to an activity product [ Ca 2+ ][ CO 3 2- ] = 10 -7.60±0.03 and a free energy of formation G f o = -325,430 ± 270 cal mol - . The enthalpy of solution of monohydrocalcite in 0.1 N HCl at 25°C led to a standard enthalpy of formation H f o = -358,100 ± 280 cal mol -1 . Estimates of the variation of G f with temperature and pressure showed monohydrocalcite to be metastable with respect to calcite and aragonite.

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