Anwar Ali*1 　Firdosa  Nabi1 　Dinesh  Chand2

Anil Kumar Nain3 　Nizamul　Haque  Ansari1 

(1 Department of Chemistry , Jamia  Millia  Islamia  (Central University) New Delhi 110025,India )

(2 Department of Chemistry, Amity School of Engineering, Super Expressway Noida-201301,U.P.,India.)

(3 Department of Chemistry, Dayal  Singh College, Delhi University New Delhi 110003,India.) 

Received Jan.24,2009

Revised May 21,2009 

Abstract The viscosities,り,and ultrasonic speeds, u, of pure benzene, triethylamine,(TEA)  tributylamine, (TBA),and those of their binary mixtures, with benzene as common component, covering the whole composition range have been measured at 278.15K,283.15K,288.15K,293.15K,298.15K,303.15K,308.15K,313.15K,and 318.15K.From the experimental data the deviations in viscosity,△り,deviations in Gibbs free energy, △G, deviations in ultrasonic speed, △u, deviations in entropies, △S*,and deviations in enthalpies, △H*,of activation of viscous flow have been determined. The sign and magnitude of these parameters were found to be sensitive towards interactions prevailing in the studied systems. Further, the excess molar volumes, VE, were calculated using data for the binary mixtures. Moreover, theoretical values of viscosities and ultrasonic speeds of the binary mixtures were calculated using different empirical relations and theories. The results were discussed in terms of average deviations (AD),in experimental and theoretical values.

PACS numbers: 43.35