Density and Comparative Refractive Index Study on Mixing Properties of Binary Liquid Mixtures of Eucalyptol with Hydrocarbons at 303.15, 308.15 and 313.15 K

Sangita Sharma,Pragnesh B Patel,Rignesh S Patel,J J Vora

doi:10.1155/2007/485378

Sangita Sharma, Pragnesh B Patel + Show 2 more

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https://doi.org/10.1155/2007/485378

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Abstract

Density and refractive index have been experimentally determined for binary liquid mixtures of eucalyptol with hydrocarbons (o-xylene,m-xylene and toluene) at 303.15 K, 308.15 K and 313.15 K. A comparative study of Lorentz-Lorenz (L-L), Weiner (W), Heller (H), Gladstone-Dale (G-D), Arago-Biot (A-B), Eykman (Eyk), Newton (Nw), Eyring-John (E-J) and Oster (Os) relations for determining the refractive index of a liquid has been carried out to test their validity for the three binaries over the entire mole fraction range of eucalyptol at 303.15 K, 308.15 K and 313.15 K. Comparison of various mixing rules has been expressed in terms of average deviation. From the experimentally measured values, refractive index deviations at different temperatures have been computed and fitted to the Redlich-Kister polynomial equation to derive the binary coefficients and standard deviations.

Highlights

Accurate knowledge of thermodynamic mixing properties of binary mixtures has great relevance in theoretical and applied areas of research
Refractive index and density measurements of binary liquid mixtures are essential for determination of composition of binary mixtures usually for non-ideal mixtures where direct experimental measurements are performed over the entire composition range
Where xi and ni represent the mole fraction and the refractive index of the ith component respectively and nm is the refractive index of the binary liquid mixture

Summary

Introduction

Accurate knowledge of thermodynamic mixing properties of binary mixtures has great relevance in theoretical and applied areas of research. The most widely used rules for predictivity of refractivity in case of binary liquid mixtures are Arago-Biot[1], Gladstone-Dale[2], Lorentz-Lorenz[3,4], Eykman[5], Weiner[6], Heller[7], Newton[8], Oster[9] and Eyring-John[10]. The refractive index deviations were fitted with Redlich-Kister[20] polynomial equation of the form nE

Results

Conclusion