Activity coefficients of MgCO o 3 and CaSO o 4 ion pairs as a function of ionic strength

Details Activity coefficients of MgCO o 3 and CaSO o 4 ion pairs as a function of ionic strength Activity coefficients of MgCO o 3 and CaSO o 4 ion pairs as a function of ionic strength

May 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976gecoa..40..549r&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 40, Issue 5, pp.549-554

Computer Science

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Scientific paper

Based on potentiometric data and gypsum solubility in mixed salt solutions, respectively, the activity coefficients of MgCO o 3 and CaSO o 4 ion pairs decrease with ionic strength ( I ) at 25°C. Computed 's for the ion pairs fit the empirical equation log i = - BI . B coefficients of 0.63 ±0.10 for MgCO o 3 and 0.45 ± 0.15 for CaSO o 4 are obtained from linear regression of log i values vs I between 0.04 and 0.6 molal. Assumptions that the activity coefficients of these neutral ion pairs equal unity or are approximated by the Setchenow expression (log i = kI ) are therefore invalid at moderate ionic strengths. Log i = - BI is the same general form as the equation of ( Chem. Rev. 24 , 233-251, 1939) for neutral dipoles.

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