Aqueous Nonelectrolyte Solutions. Part XII. Enthalpies of Mixing of Water and Deuterium Oxide with Tetrahydrofuran

Abstract

Calorimetric enthalpies of mixing have been measured over the whole composition range for the water–tetrahydrofuran and the deuterium oxide – tetrahydrofuran systems at 10.00 and 25.00 °C. The experimental S-shaped, enthalpy of mixing –composition curves are interpreted in terms of changes of the water hydrogen bonding in solution. At low tetrahydrofuran mole fractions the deuterium oxide systems are more exothermal and at high tetrahydrofuran mole fractions more endothermal than the corresponding water systems. A good correlation is found between the enthalpy of mixing and the water proton magnetic resonance chemical shift for solutions with greater than 0.55 mole fraction of tetrahydrofuran.