Abstract

Standard emf for the cell Pt/Ag/AgCl/HCl in THF-water/GE (glass electrode) in tetrahydrofuran-water mixtures containing 0–70% (w/w) of tetrahydrofuran and values of the autoprotolysis constants, Kap, of these media were obtained. The influence of variations in the solvent composition on pKap values was evaluated. The resulting equations enables us to determine pKap values in any tetrahydrofuran-water mixture, and thus permit one to establish the pH scale in these mixtures. The quasilattice quasichemical (QLQC) theory of preferential solvation was applied to obtain the degree of preferential solvation of hydrogen ions in these media, in order to explain the variation of the pKap values obtained in the tetrahydrofuran-water mixtures studied.

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