MOLAR VOLUME, MOLAR REFRACTION, AND ISENTROPIC COMPRESSIBILITY CHANGES OF MIXING AT 25-DEGREES-C FOR THE SYSTEM ETHANOL PLUS METHANOL PLUS DIBUTYL ETHER

The densities, refractive indexes, and sound velocities for mixtures o f ethanol + methanol + dibutyl ether at 25 degrees C and atmospheric p ressure, were determined and used to calculate molar volumes, molar re fractions, and isentropic compressibilities. The excess molar volumes and the deviations of molar refractions and isentropic compressibiliti es from mole fraction and volume fraction averages, respectively, of t hese properties of the pure components were satisfactorily correlated with the composition data by means of the Redlich-Kister polynomial.