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Vol. 32 No. 2 (2020): Vol 32 Issue 2

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Ultrasonic and Optical Studies of Binary Mixtures of Ethanol with Diisopropyl Ether, Cyclohexane or n-Alkanes (C6-C9) from 298.15 to 318.15 K

https://doi.org/10.14233/ajchem.2020.22354
Pinki Kashyap
Department of Chemical Engineering, Deenbandhu Chhotu Ram University of Science and Technology, Murthal-131039, India
Manju Rani
Department of Chemical Engineering, Deenbandhu Chhotu Ram University of Science and Technology, Murthal-131039, India
D.P. Tiwari
Department of Chemical Engineering, Deenbandhu Chhotu Ram University of Science and Technology, Murthal-131039, India

Corresponding Author(s) : Manju Rani

manjubanwala@gmail.com

Asian Journal of Chemistry, Vol. 32 No. 2 (2020): Vol 32 Issue 2

Abstract

Ultrasonic speeds (u) and refractive indices (n) of the binary liquid mixtures of ethanol with diisopropyl ether (DIPE) or cyclohexane or n-alkane (C6-C9) were experimentally measured from 298.15 to 318.15 K over entire composition range. Using these measurements deviation in ultrasonic speed (Δu), deviation in refractive index (Δn), excess intermolecular free length (LfE) and excess isentropic compressibility (KsE) were calculated and fitted with Redlich-Kister equation. The Δu values are negative for all binary mixture and magnitude of negative deviation for binary mixture of ethanol and n-alkane decreases as chain length increases. At equimolar composition, KsE follows the order: n-hexane > n-heptane > n-otcane > n-nonane > diisopropyl ether > cyclohexane. Experimental results were analyzed to understand the various molecular interactions present in the binary mixtures. The u values for all binary liquid solutions were also correlated using different empirical correlations such as Nomoto, impedence dependence relation and van Dael ideal mixing relation. The u for binary liquid mixtures were also computed theoretically using Schaaff′s collision factor theory. Free length theory was used to compute inter-molecular free length (LfE). Various correlations e.g., Arago-Biot (A-B), Gladstone-Dale (G-D), Heller (H), Lorentz-Lorentz (L-L), Eyring-John (E-J), Newton (Nw) and Weiner (W) were used for calculating refractive indices of selected systems theoretically.

Keywords

Ultrasonic speed Refractive index Ethanol Diisopropyl ether Alkanes
Kashyap, P., Rani, M., & Tiwari, D. (2019). Ultrasonic and Optical Studies of Binary Mixtures of Ethanol with Diisopropyl Ether, Cyclohexane or n-Alkanes (C6-C9) from 298.15 to 318.15 K. Asian Journal of Chemistry, 32(2), 303–310. https://doi.org/10.14233/ajchem.2020.22354
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