The effect of pressure on the volumes and excess volumes of aqueous solutions of organic liquids

Abstract

The compressions of binary mixtures of ten organic liquids with water have been measured at a pressure of 1013 bar (1000 atm) at 30�C. The excess compressions for these and six similar systems are compared and used to derive the excess volumes, under pressure, of fourteen of the systems. In all cases the excess volumes are numerically smaller at 1013 bar than at 1 bar and, in this sense, the solutions are more nearly ideal. ��� For the ethanol-water system, the excess volumes at the two pressures are compared with theoretical values derived from the dipole model of Haskell. There is qualitative agreement, although it may be fortuitous.