Abstract
Precise vapor pressure data for solns. of Et4NBr (concn. range of 0.04 < m[mol/(kg of solvent)] < 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) were detd. Polynomials in molalities are given for the vapor pressures of these solns., which can be used to calc. precise ref. values as needed for indirect methods. ...
Abstract
Precise vapor pressure data for solns. of Et4NBr (concn. range of 0.04 < m[mol/(kg of solvent)] < 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) were detd. Polynomials in molalities are given for the vapor pressures of these solns., which can be used to calc. precise ref. values as needed for indirect methods. Osmotic coeffs. were calcd. by taking into account the 2nd virial coeffs. of acetonitrile vapor. Discussion of the data at low concns. is based on the chem. model of electrolyte solns. At moderate concns. (up to 0.4 m), HNC calcns. were carried out using Friedman's cosphere overlap model. Pitzer equations are used to reproduce osmotic and activity coeffs. at moderate to high concns. Activity coeffs. are tabulated for practical use.
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