Murdoch University Research Repository

Welcome to the Murdoch University Research Repository

The Murdoch University Research Repository is an open access digital collection of research
created by Murdoch University staff, researchers and postgraduate students.

Learn more

Ion solvation in aqueous-organic mixtures

Hefter, G. (2005) Ion solvation in aqueous-organic mixtures. Pure and Applied Chemistry, 77 (3). pp. 605-617.

PDF - Published Version
Download (443kB)
Link to Published Version:
*Subscription may be required


The importance of ion solvation in determining the properties of electrolyte solutions in aqueous-organic solvent mixtures is discussed. Solubility measurements are shown to be particularly useful for determining the Gibbs energies of transfer of ions between solvents, which reflect differences in the overall solvation of the ions in different solvent mixtures. Solubility measurements can also be used to determine the other thermodynamic parameters of transfer, but such quantities are usually better obtained by more direct methods. The inadequacy of current theories of ion solvation to quantitatively account for the thermodynamics of ion transfer is discussed by reference to measurements on some simple model systems. Although donor/acceptor interactions can explain many of the observed effects between pure solvents, the situation is more complex in aqueous-organic mixtures because selective solvation and even solvent-solvent interactions may become significant. This is illustrated by consideration of ion transfer from water to water + t-butanol solutions, where spectacular effects are observed in the enthalpies and entropies and especially in the heat capacities and volumes.

Item Type: Journal Article
Murdoch Affiliation(s): School of Chemical and Mathematical Science
Publisher: International Union of Pure and Applied Chemistry
Copyright: © 2005 IUPAC.
Item Control Page Item Control Page


Downloads per month over past year