Carbonate equilibria in hydrothermal systems: First ionization of carbonic acid in NaCl media to 300°C

Details Carbonate equilibria in hydrothermal systems: First ionization of carbonic acid in NaCl media to 300°C Carbonate equilibria in hydrothermal systems: First ionization of carbonic acid in NaCl media to 300°C

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46.1653p&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 46, Issue 9, pp.1653-1663

Physics

7

Scientific paper

The ionization quotients of aqueous carbon dioxide (carbonic acid) have been precisely determined in NaCl media to 5 m and from 50° to 300°C using potentiometric apparatus previously developed at Oak Ridge National Laboratory. The pressure coefficient was also determined to 250°C in the same media. These results have been combined with selected information in the literature and modeled in two ways to arrive at the best fits and to derive the thermodynamic parameters for the ionization reaction, including the equilibrium constant, activity coefficient quotients, and pressure coefficients. The variation with temperature of the two fundamental quantities and were examined along the saturation vapor pressure curve and at constant density. The results demonstrated again that for reactions with minimal electrostriction changes the magnitudes and variations of and with temperature are small and, in addition, and are approximately independent of salt concentration. The results have also been applied to an examination of the solubility of calcite as a function of pH (in a given NaCl medium) for the neutral to acidic region both for systems with fixed CO 2 pressure and systems where the calcium ion concentration equals the concentration of carbon. The pH of saturated solutions of calcite with P CO 2 of 12 bars increases from 5.1 to 5.5 between 100° and 300°C.

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