Thermodynamics of binary mixtures: The effect of substituents in aromatics on their excess properties with benzylalcohol

•ρ and u measured for benzylalcohol with chloro and nitro toluenes.•VE of studied binary mixtures are positive while κSE are negative.•Estimated u of mixtures are better from Schaaff's CFT model than Jacobson's FLT.

Density (ρ) at 298.15–313.15 K and speed of sound (u) at 303.15 and 313.15 K have been measured for the binary mixtures of benzyl alcohol with chloro and nitro toluenes over the entire composition range. Experimental density and speed of sound data were used to compute excess molar volume (VE), excess speed of sound (uE), isentropic compressibility (κS) and excess isentropic compressibility (κSE). Further, excess properties were fitted with Redlich–Kister and Hwang equations. Finally, speed of sound data was analyzed in terms of theoretical models, Schaaff's collision factor theory (CFT) and Jacobson's free length theory (FLT).