Aljana Petek, Darja Pečar, Valter Doleček
Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia
Densities of ethanol-water mixtures have been measured using a
vibrating tube densimeter and a different arrangement high-pressure experimental
set up. Measurements were carried out at 298,15 K in a pressure range from
0.1 MPa to 5 MPa.
Partial molar volumes, excess molar volumes and coefficients of isothermal compressibility were calculated. The molar volumes of alcohol and it˘s partial molar volumes in mixtures with water are found to decrease monotonously with increasing pressure. Excess molar volumes are negative at all pressures. The numerical P-V relations at each composition are correlated satisfactorily as a function of pressure by the Hayward equation.