physics pp. 695–701 Ultrasonic study of molecular interaction in binary liquid mixtures at 30ÆC

Abstract. Densities ρ and ultrasonic speeds u of the binary mixtures of tetrahydrofuran (THF) with 1-butanol and tert-butanol, at 30ÆC, over the entire composition range were measured. From these data isentropic compressibility, Ks, intermolecular free length Lf, relative association RA, acoustic impedance Z, molar sound speed Rm, deviations in isentropic compressibility ∆Ks, and excess vol-ume V E were calculated. The variation of these parameters with composition of the mixture helps us in understanding the nature and extent of interaction between unlike molecules in the mixtures. Further, theoretical values of ultrasonic speed were evaluated using theories and empirical relations. The relative merits of these theories and relations were discussed