Abstract
The spectrophotometric solvent sorting method for determining the free energy of transfer of the proton Δ G t ⊖(H +) from water into mixtures of water with a co-solvent has been applied to mixtures of water with diethylene glycol. These values for Δ G t ⊖(H +) have been used to calculate Δ G t ⊖(X −) for X − = Cl −, Br − and I − from the data for Δ G t ⊖(HX). The variation of these values of Δ G t ⊖( i) with solvent composition obtained for single ions i in these mixtures is compared and contrasted with similar variations which have been found for Δ G t ⊖(i) for mixtures of water with hydrophobic alcohols and for mixtures of water with other multi-hydroxy co-solvents and alkoxyethanols by correlating the different variations with the physical properties of the mixtures. To aid this, the densities of water + diethylene glycol mixtures have been measured and the relative partial molar volumes of water and glycol in the mixtures have been calculated.
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