VISCOMETRIC STUDIES OF MOLECULAR-INTERACTIONS IN BINARY-LIQUID MIXTURES OF DICHLOROMETHANE AND SOME NONPOLAR-SOLVENTS

Viscosities of the polar molecule, dichloromethane in mixtures with no npolar solvents cyclohexane, benzene, p-xylene and mesitylene have bee n measured at two different temperatures 293.15 K and 303.15 K. The vi scosities of binary liquid mixtures prepared with cyclohexane show app reciable negative deviation from rectilinear dependence on mole fracti on of dichloromethane. This deviation decreases in the case of benzene and p-xylene and becomes positive for the binary mixture with mesityl ene. The deviation is positive even for the binary mixture with p-xyle ne at 303.15 K. An attempt has been made to correlate the deviation of viscosity from the rectilinear dependence, the parameters d of Grunbe rg-Nissan equation and C of Hind-McLaughlin-Ubbelohde equation and the interchange energy W-visc with the degree of interaction. It is chang e energy It is found that the value of C is more consistent than the v alue of d.