GIBBS FREE-ENERGIES OF TRANSFER OF THE ALKALI-METAL CHLORIDES FROM WATER INTO TERT-BUTYL ALCOHOL WATER MIXTURES

The standard Gibbs free energies of transfer ΔGXXXt of the alkali-metal chlorides MCI from water (W) into 5-90 wt.% t-butyl alcohol (TBA)-water mixtures (S) were determined from EMF measurements performed on the double cell Ag, AgCl|MCl(m), S|M(Hg)|MCl(m), W|AgCl,Ag at 25 °C in the molality range of MCI from 0.001-0.100 mol kg-1. The value of ΔGXXXt rises from Li+ to Na+ and falls from K+ to Cs+, with a maximum between Na+ and K+ whose position depends on the solvent composition. The standard potentials of the cell M|MCl(m), S|AgCl,Ag in these 10 TBA-water mixtures were also determined. The results have been interpreted and discussed in terms of solute-solvent interactions. © 1990.