ISSN:
1572-8927
Keywords:
Aprotic solvents
;
association of ions
;
conductance
;
dissociation
;
hydrochloric acid
;
ionization
;
ion-solvent interactions
;
sulfolane
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00647038
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