Evaluation of Sound Velocity in Binary Liquid Mixtures

Ultrasound velocities of binary liquid mixtures of some hydrocarbons, n-hexane, n-heptane and cyclohexane with isobutanol at 308.15 K and cyclohexane and carbon tetrachloride with n-heptanol at 306.15 K are evaluated using equations proposed by Nomoto,Van Dael and Vangeel, Jacobson relation based on intermolecular free length and Schaafs' equation based on collision factor theory. Sound velocities evaluated by above equations are compared with the experimental values. It is found that the ultrasound velocity evaluated on the basis of Schaafs' collision factor theory gives good agreement with the experimental values for the system studied. Non-ideality in the liquid mixtures has been discussed in terms of U²_exp/U²_imix where U_exp and U_imix are the experimental and ideal mixture velocities respectively.