Ultrasonic speeds and isentropic functions of [2-{2-(2-alkoxyethoxy)ethoxy}ethanol + di-n-butylether] at the temperature 298.15 K

Abstract Ultrasonic speedsuhave been measured in [2-{2-(2-methoxyethoxy)ethoxy}ethanol+di-n-butylether], [2-{2-(2-ethoxyethoxy)ethoxy}ethanol+di-n-butylether], and [2-{2-(2-butoxyethoxy)ethoxy}ethanol+di-n-butylether] systems across the entire composition ranges, at the temperature 298.15 K, using a sing-around technique, at a frequency of 4 MHz. The values have been combined with those of the excess molar volumes to obtain estimates of the productKS, mof the molar volume and the isentropic compressibility κS, and the excess valuesKS, mEwere also calculated. The deviationuDof the ultrasonic speeds from their values in an ideal mixture were also evaluated for all measured values ofx. These values are compared with the mixing function δucalculated in the paper. The behaviour ofu,uD, andKS, mEwith composition and the number of carbon atoms in the aliphatic chain of the alkoxyethanol is discussed.