Abstract
The molar conductance of solutions of HCl (concentrations from 3×10−4 to 0.033 mol-l−1) in water-sulfolane (tetramethylenesulfone) mixtures of mole fractions (X2) of sulfolane of 0.25, 0.50, 0.75, and 0.85 at 25, 30, and 40°C have been determined. The dielectric constants of the solvents varied from 45 to 60 at 25°C. The data were analyzed by the full Pitts equation, the expanded Pitts equation, and the expanded Fuoss-Hsia equations, all of which give comparable results for the limiting molar conductanceA o and for the ion-pair association constant KA for HCl. These equations were unsuccessful for the analysis of supplemental data in pure sulfolane. At 25°C, the pK for dissociation of HCl varies from 0.4 (X2=0.25) to 2.9 (X2=0.85). The extent of ion pairing is apparently strongly influenced by selective ion-solvent interactions.
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On leave 1973–75, Technical University of Gdansk, 80-952 Gdansk Poland.
On leave 1980 from Comisión Nacional de Energia Atómica, Buenos Aires, Argentina.
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Klein, S.D., Pawlak, Z., Fernández-Prini, R. et al. Conductance of HCl in water-sulfolane solvents at 25, 30, and 40°C; a comparison of conductance equations. J Solution Chem 10, 333–342 (1981). https://doi.org/10.1007/BF00647038
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DOI: https://doi.org/10.1007/BF00647038