CONCEPT OF ION ASSOCIATION IN THE THEORY OF ELECTROLYTE SOLUTIONS

Abstract Analytical solution of the associative mean spherical approximation (AMSA) and the modified version of the mean spherical approximation-the mass action law (MSA-MAL) approach for ion and ion-dipole models are used for the revision of concept of ion association in the theory of electrolyte solutions. In the considered approach in contrast to the traditional one both free and associated ion electrostatic contributions are taken into account and therefore the revised version of ion associ-ation concept is correct for weak and strong regimes of ion association. It is shown that AMSA theory is more preferable for the description of thermodynamical properties while the modified version of the MSA-MAL theory is more useful for the description of electrical properti-es. The capabilities of the developed approaches are ilustrated by the description of thermodynamic and transport properties of electrolyte solutions in weakly polar solvents. The proposed theory is applied to the explanation of the anomal properties of electrical double layer in low temperature region and for the treatment of the effect of electrolyte on the rate of intramolecular electron transfer. The revised concept of ion association is also used for the description of concentration dependence of solvent dielectric permittivity and of electrolyte solution dielectric permittivity