Abstract
Precise vapor pressure data for solutions of Et4NBr (concentration range of 0.04<m[mol-(kg of solvent)−1]<0.4), Pr4NBr (0.04<m<1.6), Bu4NBr (0.02<m<2.0), Bu4NCl (0.04<m<2.5), Bu4NI (0.05<m<2.4), Am4NBr (0.06<m<2.2) are communicated and discussed. Polynomials in molalities are given for the vapor pressures of these solutions, which can be used to calculate precise reference values as needed for indirect methods. Osmotic coefficients are calculated by taking into account the second virial coefficients of acetonitrile vapor. Discussion of the data at low concentrations is based on the chemical model of electrolyte solutions. At moderate concentrations (up to 0.4m), HNC calculations are carried out using Friedman's cosphere overlap model. Pitzer equations are used to reproduce osmotic and activity coefficients at moderate to high concentrations. Activity coefficients are tabulated for practical use.
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Barthel, J., Kunz, W. Vapor pressure data for non-aqueous electrolyte solutions. Part 5. Tetraalkylammonium salts in acetonitrile. J Solution Chem 17, 399–415 (1988). https://doi.org/10.1007/BF00647308
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DOI: https://doi.org/10.1007/BF00647308