Studies of Ionic Association. I. Alkali Halide and Sodium Nitrate in the Butyl Alcohol-Water System

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It has previously been reported that the dissociation of alkali halide and sodium nitrate between butanol and water phases could be explained reasonably if they were dissociated into free ions in each phase. The present investigation was undertaken to see to what extent dissociation occurs in the butanol phase. Conductometric measurements were carried out on solutions of LiBr, NaBr, NaCl, KCl, RbCl, and NaNO3 in the n-butanol–water system and on the solution of NaCl in the t-butyl alcohol–water system at 20°C or 25°C. These data were analyzed by using the Fuoss-Onsager equation for associated electrolytes, and the association constants were calculated to be as follows: NaBr 250, NaCl 600, KCl 610, RbCl 1850, NaNO3 180, and NaI 220 in the n-butanol–water (11 wt%) system at 25°C (except NaBr), and NaCl; 590, 160, and 75 for water wt% 30, 45, and 60 in the t-butyl alcohol–water system at 25°C, respectively. The association constants of NaCl in the t-butyl alcohol–water system were explained in terms of the simple electrostatic theory. The results were discussed briefly in comparison with conductance data reported in the literature.
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