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Numerical values of individual activity coefficients of single-ion species in concentrated aqueous electrolyte solutions and the attempt of a qualitative interpretation on a model of electrostatic interaction

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Abstract

Individual activity coefficients of single-ion species can be achieved by the factorizing of a new concentration function for the mean activity coefficient to the required power applying a purely mathematical method. These single-ion activity coefficients, calculated in this manner, are listed for some aqueous strong electrolytes. The reasons for the magnitude and variation of the activity coefficients as a function of the concentration are, without a doubt, of complex nature. Activity coefficients have their meaning as practical values. In relation to the analytical concentration, the individual activity coefficients represent the macroscopic effectiveness of the single-ion species in solution an easy manner. However, with increasing deviations from Debye–Hückel conditions of an infinitely diluted electrolyte solution, a physically correct interpretation of the macroscopically visible activity coefficient is becoming more and more difficult, if not impossible to find. On the basis of a model of electrostatic interaction, an attempt has been made to create a qualitative interpretation of the individual ion activity coefficients in concentrated aqueous electrolyte solutions which were calculated applying the purely mathematical method by Ferse.

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Acknowledgments

I want to express my thanks to Dr. Hans-Otfried Müller, Technische Universität Dresden, Institut für Mathematische Stochastik, Germany, for the good cooperation in case of the implementation of computer calculations.

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  1. Armin Ferse

    Present address: , Wiesenstr. 8, 01277, Dresden, Germany

Authors and Affiliations

  1. Institute of Physical Chemistry and Polymer Physics, Leibniz-Institute of Polymer Research Dresden, Hohe Str. 6, 01069, Dresden, Germany

    Armin Ferse

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  1. Armin Ferse
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Correspondence to Armin Ferse.

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Ferse, A. Numerical values of individual activity coefficients of single-ion species in concentrated aqueous electrolyte solutions and the attempt of a qualitative interpretation on a model of electrostatic interaction. J Solid State Electrochem 17, 1321–1332 (2013). https://doi.org/10.1007/s10008-012-1989-8

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  • DOI: https://doi.org/10.1007/s10008-012-1989-8

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