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Title of Journal: J Solid State Electrochem

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Abbravation: Journal of Solid State Electrochemistry

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Springer-Verlag

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DOI

10.1002/adaw.30005

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1433-0768

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Comment on “Factorizing of a concentration functio

Authors: Francesco Malatesta
Publish Date: 2011/08/26
Volume: 15, Issue: 10, Pages: 2169-
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Abstract

A Ferse and HO Müller have recently presented a mathematical method aimed at subdividing the activity coefficients of electrolytes into functions of individual ionic species these functions are suggested to be the ionic activity coefficients By examining the method it is possible to verify that the peculiar mathematical structure of the functions in question really guarantees a unique result unlike the usual subdivisions of electrolyte activity coefficients which admit infinite possibilities for the ionic activity coefficients But the subsequent step of the reasoning ie that these functions have to be the activity coefficients of the ionic species is an illation And indeed another kind of subdivision in individual functions can be exemplified whose mathematical structure also guarantees results that are unique and perfectly compatible with all theoretical properties of the ionic activity coefficients It is concluded that it is impossible to rely on mathematical method to pull the activity coefficients of ions out of the mean activity coefficients of the electrolytes And hence the individual functions for the ionic species determined by Ferse and Müller do not represent the ionic activity coefficients and do not have any particular utility

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