0.015 mol.kg(-1) to 0.5 mol.kg(-1), at temperatures T from 278.15 K to 368.15 K, and at the pressure 0.35 MPa, using a vibrating tube densimeter (DMA 512P, Anton Paar, Austria). A fixed cell, power-compensation, differential-output, temperature-scanning calorimeter (NanoDSC 6100, Calorimetry Sciences Corporation, American Fork, UT, USA) was used to measure the heat capacities of the same solutions at the same pressure and at 278.15 less than or equal to T/K less than or equal to 393.15. Apparent molar heat capacities C-p,(phi) and apparent molar volumes V-phi were calculated for these solutions and fitted by regression to empirical equations describing the surfaces (C-p,(phi), T, m) and (V-phi, T, m).