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Issue 6, 2001
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The mean spherical approximation and the prediction of the size of the species involved in an ionization equilibrium in saline media

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Abstract

The unrestricted version of the mean spherical approximation is applied to describe the ionization equilibrium of benzoic acid, as a typical simple system for carboxylic acids, in the presence of an excess of background electrolyte and variable ionic strength. When the activity coefficients are theoretically determined by use of the mean spherical approximation (MSA), the thermodynamic properties of the ionization equilibrium in 1:1 electrolytes for ionic strengths up to 2.5 M can be accurately described, provided different sizes are assumed for each species in solution. The results of this study show that the application of MSA allows one to estimate the size of the species involved in an ionization process from experimental data of stoichiometric equilibrium constants, an alternative normally not explored. However, results suggest that it is necessary to include more sophisticated models of MSA in order to develop this approach with more confidence.

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Publication details

The article was received on 18 Dec 2000, accepted on 29 Jan 2001 and first published on 22 Feb 2001


Article type: Paper
DOI: 10.1039/B010103F
Phys. Chem. Chem. Phys., 2001,3, 1053-1056

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    The mean spherical approximation and the prediction of the size of the species involved in an ionization equilibrium in saline media

    T. Vilariño, J. L. Barriada and M. E. Sastre de Vicente, Phys. Chem. Chem. Phys., 2001, 3, 1053
    DOI: 10.1039/B010103F

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