Abstract
The enthalpies of dissolution {ie2391-1} of aniline in mixtures of water with methanol andtert-butyl alcohol were determined in the whole concentration range of mixed solvents at 25 °C. Maxima of endothermicity were found in both systems at −0.3 and −0.06 molar fractions, respectively. The data obtained were compared with the thermochemical characteristics of the nonelectrolytes studied previously (dimethylsulfoxide, nitromethane, formamide,etc). The conclusion was drawn that the behavior of aniline in water-alcohol mixtures is mainly determined by its proton-donating ability and solvation of the benzene ring. A comparison of acoustic data and spectral and thermodynamic characteristics showed that thermochemical data are the most sensitive indicator for energy and structural changes occurring upon variation of the composition of a mixed solvent.
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