Determination of Excess Volumes of Binary Liquid Mixtures of Benzene and Carbon Tetrachloride with Cumene and Pseudocumene

Experimental values of densities ( ), viscosities ( ) and ultrasonic velocities for binary mixtures of benzene and carbon tetrachloride with cumene and pseudocumene have been measured at two different temperatures 303.15 and 293.15 K. Excess volume of mixing ( E), deviation of excess volume ( E) from ideal mole fraction law and parameter (d) as a measure of strength of interaction between components of binary mixtures have been calculated from data of densities and viscosities. These results were fitted to Redlich-Kister polynomial equations to estimate the binary coefficients and standard errors. Excess volumes have been found to be negative and positive in sign for binary mixture of carbon tetrachloride with cumene and pseudocumene and carbon tetrachloride with benzene at entire mole-fraction range and at both the temperatures 303.15 and 293.15 K. On the other hand were found to be negative for binary mixtures of carbon tetrachloride with cumene and pseudocumene except the binary mixture of carbon tetrachloride with benzene at entire mole-fraction range at T = 293.15 K. Positive value of excess volumes for three mixtures (carbon tetrachloride with benzene, cumene and pseudocumene) show feeble molecular interactions among the components. However, the negative value of for binary mixtures of carbon tetrachloride with cumene and pseudocumene show weak interactions among the components. The experimental values of excess volumes of mixing ( E) have been analyzed in the light of Flory’s theory.