ULTRASONIC STUDY OF MOLECULAR ASSOCIATION IN LIQUID-MIXTURES

Ultrasonic study of 1:1 mixture of ethyl acetate/butyl acetate and phe nol/n-butyl alcohol in carbon tetrachloride (low concentration region) have been carried out at a frequency of 1 MHz and temperature of 30 d egrees C. Using the measured ultrasonic velocity and density, adiabati c compressibility, inter-molecular free length, molar sound velocity a nd molar compressibility have been calculated. The ultrasonic velocity shows a maxima and adiabatic compressibility a corresponding minima a s a function of concentration for the two mixtures containing phenol a nd the third one containing ethyl acetate and n-butyl alcohol. The mix ture containing butyl acetate and n-butyl alcohol exhibits an increase of velocity with increasing concentration. The results indicate a pos sible complex formation between the unlike molecules through hydrogen bonding.