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Volumetric and Thermodynamic Studies of Molecular Interactions in Ternary Liquid Mixtures at 303, 308 and 313K

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Author(s): AN. Kannappan1 | S. Thirumaran | R. Palani

Journal: Journal of Physical Science
ISSN 1675-3402

Volume: 20;
Issue: 2;
Start page: 97;
Date: 2009;
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Keywords: Ultrasonic velocity | density and viscosity were measured for mixtures of

ABSTRACT
Ultrasonic velocity, density and viscosity were measured for mixtures of 1-alkanols, namely, 1-propanol, 1-butanol, 1-pe ntanol and 1-hexanol, with N, N-dimethylformamide (DMF) in cyclohexanone at 303, 308 and 313K. The experimental data were used to calculate the excess free volume (Vf E), excess internal pressure ( π iE),and Gibb’s free energy (ΔG*), which were discussed in the light of molecular interaction existing in the mixtures. It was observed that the addition of DMF to mixtures caused the dissociation of the hydrogen-bonded structure of 1-alkanols. Furthermore, the DMFalkanolinteractions were weaker than the alkanol-ketone interactions in the mixtures.
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