Refractive index study on mixing properties of some binary liquid mixtures

Department of Chemistry, Hemchandracharya North Gujarat University, Patan-384 265, Gujarat, India E-mail : smridhee2000@yahoo.co.in Manuscript received 12 July 2005, revised 24 March 2006, accepted 4 April 2006 Density and refractive index have been experimentally determined for binary liquid mixtures of methyl acetate, ethyl acetate, propyl acetate and butyl acetate with \(n\)-butanol, iso-butanol at 303.15 K, 308.15 K and 313.15 K. A comparative study of Lurentz-Lurenz (L·L), Weiner (W), Heller (H), Gladstone-Dale (G-D), Arago-Biot (A-B), Eykman (Eyk), Newton (Nw), Eyring- John (E·,I), Oster (Os) relations for determining the refractive index of a liquid has been carried out to test their validity for the eight binaries uver the entire mole fra1 tion range of methyl acetate, ethyl acetate, propyl acetate and butyl acetate at 303.15 K, 308.15 K, 313.15 K. Comparison of various mixing rules has been expressed in terms of average percentage 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