Thermodynamic functions of transfer

The thermodynamic functions of transfer of individual ions cannot, of course, be studied experimentally, since only complete electrolytes are thermodynamic components, so that an extrathermodynamic assumption is needed in order to split the measurable quantity into the contributions from the individual ions. A commonly employed assumption is that for a reference electrolyte with large, univalent, nearly spherical cation and anion of nearly equal sizes the measured... 

The choice of the appropriate concentration scale for standard thermodynamic functions of transfer was extensively discussed by Ben-Naim who showed that the molarity scale has a number of advantages over the others. 

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