We determined the excess partial molar enthalpy and the excess partial molar volume, HTFE E , VTFE E , of 2,2,2-trifluoroethanol (TFE) in TFE-H2O at 25.0 ˚C. We then evaluate the TFE-TFE interactions in terms of enthalpy and volume, HTFE-TFE E and VTFE-TFE E , graphically without resorting to any model dependent fitting functions. Both model-free third derivatives indicate that TFE is a hydrophobic solute and that as other hydrophobic alkyl mono-ols there are three distinct mixing schemes, Mixing Scheme I, II, and III in their aqueous solutions. The relative strength in hydrophobicity between TFE and tertbutylalcohol (TBA), for example, gave a mixed message within the behavior of these third derivative quantities. We thus applied the 1-propanol(1P) probing methodology (Koga, Y.

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