Apparent molar volumes and apparent molar heat capacities of aqueous d-lactose · H 2O at temperatures from (278.15 to 393.15) K and at the pressure 0.35 MPa

Abstract

Apparent molar volumes V φ and apparent molar heat capacities C p, φ were determined for aqueous solutions of d-lactose · H 2O at molalities (0.01 to 0.34) mol · kg −1 at temperatures (278.15 to 393.15) K, and at the pressure 0.35 MPa. Our V φ values were calculated from densities obtained using a vibrating tube densimeter, and our C p, φ values were obtained using a twin fixed-cell, power-compensation, differential-output, temperature-scanning calorimeter. Our results for d-lactose(aq) and for d-lactcose · H 2O were fitted to functions of m and T and compared with the literature results for aqueous d-glucose and d-galactose solutions. Infinite dilution partial molar volumes V 2 ∘ and heat capacities C p,2 ∘ are given over the range of temperatures.