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Electromotive force measurements of cells of the type Pt.H, (g, 1 atm)IHCl(m), ButOH (X),H,O(lOO -X)lAgCl-Ag at 5,15, 25, 35, and 45 "C have been used to evaluate (i) the standard potentials of the Ag-AgCI electrode for X = 10, 20. 40, and 70% (w/w) by a polynomial curve-fitting technique, (ii) the mean molal activity coefficients of hydrochloric acid (0.005-0.2 mol kg-l), (iii) the primary medium effects, (iv) the relative partial molal enthalpies, and (v) the thermodynamic functions for the transfer of HCI from water to the respective solvent media. The values of Emo in each solvent have been represented as a function of temperature. The significance of the results has been discussed in relation to the acid-base properties and the breakdown of the structure of water on the addition of t-butyl alcohol.THE behaviour of electrolytes in aqueous organic mix-tures1-3 is of interest. We chose the binary water-tbutyl alcohol solvent mixtures because these media are frequently used for studies of colloid science,* chemical equilibria,6 viscosity and diffusion coefficients,6 and also in the investigation of electronic transitions.' To our knowledge no potentiometric investigation has been made on the effect of these solvent mixtures in the study of acid-base equilibria.

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