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The thermodynamic properties of (HCl (mA) + NaCl (mB)-tert-C4H9OH + H2O) system were studied by means of e.m.f. measurements in the cell without liquid junction at constant total ionic strength I=1.00 mol · kg−1 from 278.15 K to 318.15 K. The standard electrode potential of Ag–AgCl and activity coefficient of HCl in the mixed solvents have been determined. The results show that the activity coefficient of HCl in HCl–NaCl solution still obeys Harned’s Rule and the logarithm of HCl activity coefficient, lgγA, is a linear function reciprocal of temperature at constant composition of the mixture. The standard transfer Gibbs free energy of HCl was calculated. [Copyright &y& Elsevier]

Abstract: The thermodynamic properties of system (HCl+NaCl+C6H12O6+H2O) were studied by e.m.f. measurement in the cells without liquid junction: At constant total ionic strength (0.5, 1.0, 1.5, and 2.0) mol·kg−1, from (5 to 45) °C, where mA and mB are the molalities of HCl and NaCl, respectively, and w is the mass fraction of fructose in the mixed solvent, which is w=0.1 during all the measurements. The standard electrode potential of in the pure water and mixed solvent has been determined from cells (A) and (B). The activity coefficients lgγA of HCl in the mixed solvent system have been determined from cell (C).The results show that the activity coefficients of HCl in (HCl+NaCl) solutions still obey Harned’s Rule. The standard transfer Gibbs free energies, entropy and enthalpy of HCl have been calculated. The primary, secondary and total medium effect of HCl have been calculated and discussed. [Copyright &y& Elsevier]