ASSOCIATION CONCEPTS IN ELECTROLYTE-SOLUTIONS

Association in electrolyte solutions is investigated as a part of the thermodynamic and transport excess functions in the framework of diffe rent theoretical approaches, and the influence of solvent-averaged sho rt range interactions between ions on the association constant is disc ussed. The low concentration chemical model (IcCM) is compared with re sults of the MSA theory for equilibrium and nonequilibrium situations for models which include interactions with ion pairs. At the limit of strong electrostatic association a parameter-free theory is derived fo r ion pairs made up by ions of different diameters. The limitations of the models, and the inherent approximations of the theories are discu ssed. (C) 1998 Elsevier Science B.V. All rights reserved.