Application of the mean spherical approximation and ion association to describe the activity coefficients of aqueous 1:1 electrolytes1 |
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Authors: | Alex C Tikanen WRonald Fawcett |
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Institution: | Department of Chemistry, University of California, Davis, CA 95616, USA |
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Abstract: | The unrestricted version of the mean spherical approximation has been applied to describe the concentration dependence of the mean ionic activity coefficients for 12 aqueous electrolyte solutions for which extensive permittivity data are also available. By using the actual solvent permittivity rather than that of the pure solvent, it is shown that this primitive model fits the experimental data in almost all cases to the maximum concentrations for which the permittivity can be described by the use of three adjustable parameters, namely, an effective ionic diameter, σ+ or σ?, the effective ion pair diameter σip, and the association constant Kas for ion pair formation. The values of Kas obtained are discussed with respect to results from experiments reported in the literature. |
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Keywords: | Corresponding author E-mail: fawcett@indigo ucdavis edu |
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