Solvation of small hydrophobic molecules in formamide: A calorimetric study |
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Authors: | D. Berling G. Olofsson |
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Affiliation: | (1) Thermochemistry, Chemical Center, Lund University, P.O Box 124, S-221 00 Lund, Sweden |
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Abstract: | The solubility and enthalpy of solution of benzene, cyclohexane, hexane, and heptane in formanide have been determined from titration microcalorimetric experiments at 25°C. The solution enthalpies are significantly more endothermic than in water but still the solubility is much higher. The entropy changes in formamide are small and positive and do not vary significantly with size. The enthalpies of solution of some 1-alkanols, 1-chloro- and 1,5-dichloropentane and pentane-1,5-diol were measured as functions of concentration. The solution enthalpies for 1-alkanols from methanol to decanol increase linearly with chain length. The enthalpic interaction coefficients hxx are small and negative in formamide while they are large and positive in water. The partial molar heat capacities Cp,2o for 1-propanol, 1-pentanol, benzene and cyclohexane in formamide were determined at 25°C from drop heat capacity measurements. Values of Cp,2o are only slightly larger than the molar heat capacities of the liquid solutes. |
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Keywords: | Solubility enthalpy of solution heat capacity hydrocarbons 1-alkanols formamide calorimetry |
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