Refractive indices of binary mixtures of 1-iodobutane with aromatic hydrocarbons

Abstract

Abstract

The refractive index (n_D) of pure 1-iodobutane, benzene, toluene, o-xylene, m-xylene, p-xylene, mesitylene and those of their binary mixtures with 1-iodobutane as a common component has been measured over the entire composition range expressed by mole fraction (x₁) experimentally at temperature 303.15, 308.15, and 313.15 K. From the experimental data, deviation in refractive index (Dn_D) has been calculated and fitted to Redlich-Kister polynomial equation. The deviation parameters were plotted against mole fraction of the 1-iodobutane over whole composition range. The observed positive values of deviation parameters have been explained on the basis of the intermolecular interactions present in these mixtures. A comparative study of mixing rules namely Arago and Biot, Dale and Gladstone, Lorentz and Lorenz, Eykman, Weiner, Heller, Newton, Oster and Eyring-John has been carried out to test their validity for these binaries over entire mole fraction of 1-iodobutane at three temperatures. Comparison of various mixing rules has been expressed in terms of average deviation.