Abstract
From EMF measurements performed on the double cell Ag, AgX; MX (m). S; M (Hg); MX (m), W; AgX, Ag, the Standard absolute potentials of M; M
+ (M = Li, Na and K) and Ag, AgX (X = Cl, Br and I) electrodes in ethylene glycol and its aqueous mixtures over the full composition range of the solvent, have been determined at 25 °C by a new procedure. The radii of solvated cations and their solvation extent in these media have been computed. The standard Gibbs energies of transfer, Δ
G
o
t
, of alkali-metal halides from water to the glycolic solvents have been obtained from the EMF data. The individual ionic contributions to Δ
G
o
t have also been evaluated, employing a recent method without any extra-thermodynamic assumptions. The observed increase in Δ
G
o
t
values of the alkali-metal M
+ or halide X
− ions with increasing concentration of glycol and their relative order in any solvent has been discussed and analyzed with respect to ion solvation.