Abstract
Densities of solutions of tetra- n-butylammonium bromide in mixtures of N,N-dimethyl-formamide ( dmf) + water covering the whole mole fraction range have been measured at 298.15 K using an oscillating-tube densimeter. The apparent molar volumes V 2, φ of Bu 4NBr evaluated from the experimental results were extrapolated to infinite dilution by means of the Masson equation. The experimental slopes A V ★ change from +6.8 cm 3 mol −1 in pure dmf to −6.7 cm 3 mol −1 in pure water. The low value of the partial molar volume at infinite dilution V 2 ∞ of Bu 4NBr in pure dmf is apparently due to the Br − ion. The minimum in V 2 ∞ for water-rich solvents is attributed to “hydrophobic” interactions.
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