Studies in ion solvation in non-aqueous solvents and their aqueous mixtures. Part 21.—Free energies of transfer of alkali-metal halides in the acetone + water system to 60%(w/w) acetone with cation-selective electrodes

Abstract

The failure of alkali-metal amalgam electrodes to function satisfactorily in acetone + water mixtures has dictated the use of cation-sensitive glass electrodes to determine ΔG^z.ccsh;_t, for transfer of alkali-metal halides from water to mixtures containing up to 60%(w/w) acetone. Data for fluorides have been obtained using LaF₃ electrodes.

The behaviour of both anions and cations as functions of ionic radius is that now established for mixtures which are more ‘basic’ than water. A comparison of the present results with those obtained earlier for DMSO + water mixtures suggests that solvation of Li⁺ by acetone is hindered compared with solvation by DMSO.