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Enthalpies of the urea-tert-butanol-water system at 25°C

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The enthalpies of solution of urea (U) in water (W)-tert-butanol (TBA) mixtures and of TBA in W-U mixtures, the enthalpies of dilution of TBA in W, and the enthalpies of mixing of U and TBA aqueous solutions were measured with a solution calorimeter and a flow microcalorimeter. Enthalpies of transfer of U and TBA to the mixed solvents were derived. Also, pair and triplet interaction parameters between the various solutes were derived from the mixing and dilution experiments. The enthalpic pair parameter hU-TBA is positive, suggesting that the main contribution to this parameter is the decrease in hydrophobic hydration of TBA in the presence of U.

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Desnoyers, J.E., Perron, G., Avédikian, L. et al. Enthalpies of the urea-tert-butanol-water system at 25°C. J Solution Chem 5, 631–644 (1976).

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