The densities and ultrasonic speeds in binary mixtures of
tetrahydrofuran (THF) with alkanols (1-hexanol, 1-octanol and 1-decanol) have
been measured over the whole composition range at 35 °C. Isentropic
compressibility, intermolecular free length, relative association, molecular
association, acoustic impedance, excess compressibility, excess molar volume,
excess acoustic impedance and excess partial molar volume of alkanols in THF
were calculated using the values of density and ultrasonic speed. The variation
of these parameters with composition indicates that the disruption of
associated structure of alkanols on addition of THF dominates over that of weak
interaction between unlike molecules in all the three systems investigated.
Moreover, a comparison of theoretical ultrasonic speeds, calculated by using
collision factor theory (CFT), free length theory (FLT), Nomoto’s empirical
relation and Van Dael-Vangeel’s ideal mixing relation, with those obtained
experimentally reveals that CFT, FLT and Nomoto’s relation predict the data
well than ideal mixing relation.
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