Physics
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51..829p&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 51, Issue 4, pp.829-837
Physics
1
Scientific paper
Apparent molar volumes and osmotic coefficients of NaOH solutions, calculated from critically evaluated literature data on volumes and vapor pressures, were used to fit the Pitzer equations to yield ion-interaction parameters as a function of temperature and pressure. These parameters allow the calculation of osmotic and activity coefficients from 0-350°C, saturation pressure to about 400 bars and 0-10 molal NaOH, and volumetric properties at saturation pressure over the same temperature and concentration range. Because the parameters for osmotic and activity coefficients above 300°C are based on less precise data, and because of possible ion-pairing above this temperature, calculated values above 300°C are considered only as best estimates available at this time. Partial molar volumes at infinite dilution calculated for NaOH are combined with literature data for NaCl, HCl, and H 2 O to yield the pressure dependence of the ionization of water to 200°C, and are also combined with the potentiometric data of Sweeton et al . (1974) on the ionization of water to calculate the infinitely dilute partial molar volume of HCl to 300°C. Specific volumes of NaOH solutions at saturation pressure and up to 350°C are also calculated and tabulated.
Pabalan Roberto T.
Pitzer Kenneth S.
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