Journal of Pure and Applied Ultrasonics

J. D. Pandey ¹, K. K. Tiwari ¹, Rupali Sethi ¹, Vinay Sanguri ¹

Affiliations
1 Department of Chemistry, University of Allahabad, Allahabad, IN

Abstract

Density (ρ) and ultrasonic velocity (u) for the three binary systems viz. acetonitrile+nitromethane (System I), 1, 2- dichloroethane+toluene (System II) and 1, 2-dichloroethane+p-xylene (System III) have been measured at three different temperatures 298.15 K, 303.15 K and 308.15 K. The experimental data have been used to obtain a number of important and useful thermodynamic parameters such as isentropic compressibility (β_s), intermolecular free length (L_f), acoustic impedance (Z), excess molar volume (V^E), deviation in ultrasonic velocity (Δu), excess isentropic compressibility ((β_s^E), excess acoustic impedance (Z^E) and excess intermolecular free length (L_f^E). The results are discussed in terms of dipole-dipole interactions and hydrogen bonding.

Keywords

Ultrasonic Velocity, Isentropic Compressibility, Excess Acoustic Impedance, Dipole-Dipole Interactions, Hydrogen Bonding.

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N. K. Soni ¹, K. K. Tiwari ¹, D. K. Dwivedi ², Vikash Singh ³, V. K. Singh ³, A. K. Shukla ⁴

Affiliations
1 Department of Chemistry, University of Allahabad, Allahabad, 211 002, IN
2 Electronics Department, Ewing Christian College, Allahabad, IN
3 Rashtriya Post Graduate College, Jamuhai, Jaunpur-222001, Uttar Pradesh, IN
4 Department of Chemistry, S.P. Mukherjee Government Degree College, Allahabad, IN

Abstract

Various thermodynamic properties viz. acoustic impedance, Z, intermolecular free length, Lr molar sound velocity, R, molar compressibility, W, and molecular association M_A, have been computed for five binary liquid mixtures (Dimethylcarbonate (DMC) + methanol, DMC + cyclohexane, methanol + cyclohexane, DMC + benzene, and methanol + benzene) at 298.15 K. Interactions between the components of binary systems are studied in terms of excess acoustic impedance, Z^E, excess intermolecular free length, L_f^E deviation in molar sound velocity, ΔR, deviation in molar compressibility, ΔW, and deviation in ultrasonic velocity, Δu. Sign and magnitude of the excess properties give an estimate of strength of the unlike interactions in a iquid mixture. Small positive values of L_f^E and negative values of Z^E and Δu signify the existence of weak interactions between component molecules of all the binary systems. Moreover, an attempt has also been made to examine the validity of several theories and relations, viz. free length theory, Nomoto relation, Junjie relation, Van Deal & Vangeel ideal mixing relation and collision factor theory for the theoretical predictions of ultrasonic velocity in the systems under consideration.

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