Abstract
A Tian-Calvet calorimeter type was adapted to measure differential enthalpies of solution. To test the calorimetric system and the experimental procedure, the differential enthalpies of solution of NaCl in water at 298.15 K in the molality range from 0.1 to 4.0 mol · kg −1 were measured. The results were compared with values computed using the enthalpy of solution at infinite dilution and the relative apparent molar enthalpy as a function of molality tabulated by Parker. The literature data have been analysed jointly with the results reported in this work to obtain the values of the relative partial molar enthalpy L 2( m) and the relative apparent molar enthalpy L φ ( m).
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