A ALI and A K NAIN

Department of Chemistry, Jamia Millia Islamia, New Delhi 110 025, India

 Abstract.

Densities r and ultrasonic speeds u of the binary mixtures of tetrahydrofuran (THF) with 1-butanol and tert-butanol, at 30^oC, over the entire composition range were measured. From these data isentropic compressibility, K_s, intermolecular free length L_f, relative association R_A, acoustic impedance Z, molar sound speed R_m, deviations in isentropic compressibility DK_s, and excess volume 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. 

Keywords:  Ultrasonic speed; intermolecular interactions; binary mixtures; theoretical evaluation.

Pacs Nos.  43.35.Bf; 62.60.+V