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Title: Influence of alkyl group and temperature on thermophysical properties of carboxylic acid and their binary mixtures
Authors: Bahadur, Indra 
Deenadayalu, Nirmala 
Naidoo, Paramespri 
Ramjugernath, Deresh 
Singh, Sangeeta 
Keywords: Density;Sound velocity;Refractive index;Carboxylic acid;Sound velocity mixing rules;Lorentz–Lorenz approximation
Issue Date: 30-Jun-2014
Publisher: Elsevier B.V.
Source: Bahadur, I.; Singh, S.; Deenadayalu, N.; Naidoo, P. and Ramjugernath, D.. 2014. Influence of alkyl group and temperature on thermophysical properties of carboxylic acid and their binary mixtures. Thermochimica Acta. 590 151-159
Journal: Thermochimica acta (Print) 
n this work, volumetric, acoustic and refractive index methods have been used to study the interactions between carboxylic acids mixtures as a function of temperature and concentration. The density (r), sound velocity (u), refractive index (n) of butanoic acid, pentanoic acid and heptanoic acid and their binary systems (butanoic or heptanoic acid + pentanoic acid) have been measured at 293.15, 298.15, 303.15, 308.15 and 313.15 K and at p = 0.1 MPa. The Lorentz–Lorenz approximation and sound velocity mixing rules were used to test the accuracy of the experimental data. The derived properties such as excess molar volumes, VEm, isentropic compressibilities, ks, excess isentropic compressibilities, ksE, and deviation in refractive indices, Dn, were also calculated. The Redlich–Kister polynomial equation was used to fit the excess/deviation properties. These results are useful for describing the intermolecular interactions that exist between the components in mixtures. This work also tests various sound velocity mixing rules to calculate the sound velocity of the binary mixture from pure component data, as well as examine the use of the Lorentz–Lorenz approximation to predict density from refractive index and vice versa.
ISSN: 0040-6031
Appears in Collections:Research Publications (Applied Sciences)

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