Journal of Chemical Thermodynamics, Vol.40, No.2, 248-259, 2008
Apparent molar volumes and apparent molar heat capacities of aqueous tetrahydrofuran, dimethyl sulfoxide, 1,4-dioxane, and 1,2-dimethoxyethane at temperatures from 278.15 K to 393.15 K and at the pressure 0.35 MPa
We determined apparent molar volumes V-phi at 278.15 <= (T/K) <= 368.15 and apparent molar heat capacities C-p,C-phi at 278.15 <= (T/K) <= 393.15 at p = 0.35 MPa for aqueous solutions of tetrahydrofuran at m from (0.016 to 2.5) mol . kg(-1), dimethyl sulfoxide at m from (0.02 to 3.0) mol . kg(-1), 1,4-dioxane at m from (0.015 to 2.0) mol . kg(-1), and 1,2-dimethoxyethane at m from (0.01 to 2.0) mol . kg(-1). Values of V-phi were determined from; densities measured with a vibrating-tube densimeter, and values of C-p,C-phi were determined with a twin fixed-cell, differential, temperature-scanning calorimeter. Empirical functions of m and T for each compound were fitted to our V-phi and C-p,C-phi results. (C) 2007 Elsevier Ltd. All rights reserved.
Keywords:calorimetry;densimetry;apparent molar volume;apparent molar heat capacity;tetrahydrofuran;dimethyl sulfoxide;1,4-dioxane;1,2-dimethoxyethane