Abstract
The molar conductances of solutions of hydrochloric acid, sodium chloride, sodium acetate, and acetic acid were measured in water-ethylene carbonate (EC) solvent mixtures at 25 and 40°C. These solvents have dielectric constants higher than that of water. Four solvent compositions, in which the mole fraction (x 2) of EC was 0.2, 0.4, 0.5, and 0.6, were studied at 25°C. For HCl and acetic acid at 40°C, additional measurements were made atx 2=0.8 and 1.0. Analysis of the data by the Pitts equation was successful up tox 2=0.6 and for HCl tox 2=0.8. A graphical method, together with Λ0 derived from the measurements for HCl, NaCl, and NaAc, yielded the dissociation constant of acetic acid up tox 2=0.6. As EC is added, all the compounds studied displayed increased ion association. The acidic strength of acetic acid is greatly reduced; the dissociation constant atx 2=0.6 is only 1/1000 that in water. The behavior of these electrolytes reflects the poor solvating power of EC, and the dielectric constant plays only a minor role.
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Boerner, B.R., Bates, R.G. Conductance of HCl, NaCl, Na acetate, and acetic acid in water-ethylene carbonate solvent mixtures at 25 and 40°C. J Solution Chem 7, 245–256 (1978). https://doi.org/10.1007/BF00644272
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DOI: https://doi.org/10.1007/BF00644272