Speeds of sound, isentropic compressibilities, viscosities and excess molar volumes of binary mixtures of methylcyclohexane + 2-alkanols or ethanol at T = 298.15 K
Introduction
This paper is a continuation of our earlier work related to the study of thermodynamic properties of binary mixtures [1], [2], [3], [4]. In recent years, measurements of thermodynamic, acoustic and transport properties have been adequately employed in understanding the nature of molecular systems and physico-chemical behavior in liquid mixtures. The nonrectilinear behavior of above mentioned properties of liquid mixtures with changing mole fractions is attributed to the difference in size of the molecules and strength of interactions. Here, we have reported densities, viscosities, speeds of sound, isentropic compressibilities, excess isentropic compressibilities, excess viscosities and excess molar volumes of MCH binary mixtures with six linear 2-alkanols (C3 to C8) and ethanol at T = 298.15 K. This work will also provide a test of various empirical equations to correlate viscosity and speeds of sound of binary mixtures containing one polar and one nonpolar component.
Section snippets
Experimental
Methylcyclohexane (mass fraction > 0.99), ethanol (mass fraction > 0.99), 2-propanol (mass fraction 0.99), 2-butanol (mass fraction 0.99), 2-pentanol (mass fraction > 98), 2-hexanol (mass fraction > 0.98), 2-heptanol (mass fraction > 0.99) and 2-octanol (mass fraction > 0.97) were purchased from Merck. 2-Octanol was purified by the standard method described by Perrin and Armarego [5]. Densities of the pure liquids and their mixtures at T = 298.15 K were measured with an Anton Paar digital densimeter (Model
Densities and excess molar volumes
The excess molar volumes of the solutions of molar composition x were calculated from the densities of the pure liquids and their mixtures according to the following equation:where ρ, ρ1 and ρ2 are the densities of the solution and pure components 1 and 2, respectively, and M1 and M2 are the molar masses of the pure components. The excess molar volumes are accurate to ±3 · 10−4 m3 · mol−1. The corresponding values of binary mixtures of [x1MCH + (1
Acknowledgements
Authors are thankful to the authorities of the University for the providing the necessary facilities to carry out the work.
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