Table of Contents
ISRN Physical Chemistry
Volume 2014, Article ID 639813, 10 pages
http://dx.doi.org/10.1155/2014/639813
Research Article

Volumetric Properties of Aqueous Solutions of Ethylene Glycols in the Temperature Range of 293.15–318.15 K

1Department of Chemistry, College of Education for Pure science/Ibn Al-Haitham, University of Baghdad, P.O. Box 4150, Baghdad 10001, Iraq
2Chemistry Department, University of Kassala, P.O. Box 266, Kassala 31111, Sudan
3Industrial Chemistry Centre, Royal Scientific Society, P.O. Box 1438, Al-Jubaiha 11941, Amman, Jordan

Received 18 November 2013; Accepted 24 December 2013; Published 10 February 2014

Academic Editors: M. Lewis and R. D. Parra

Copyright © 2014 Omer El-Amin Ahmed Adam et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Densities of aqueous solutions of Ethylene glycol (EG), diethylene glycol (DEG), and triethylene glycol (TEG) were measured at temperatures from 293.15 to 318.15 K and molalities ranging from 0.0488 to 0.5288 mol·kg−1. Volumes of all investigated solutions at a definite temperature were linearly dependent on the solute molality; from this dependence the partial molar volumes at infinite dilution were determined for all solutes. It was found that the partial molar volumes at infinite dilution were concentration independent and slightly increase with increasing temperature. The partial molar volumes at infinite dilution or the limiting apparent molar volumes of ethylene glycols were fitted to a linear equation with the number of oxyethylene groups () in the solute molecule. From this equation a constant contribution of the terminal () and the () groups to the volumetric properties was obtained. The thermal expansion coefficient () for all investigated solutions was calculated at temperatures from 293.15 to 318.15 K. The thermal expansion coefficients for all solutes increase with increasing temperature and molality. Values of () were higher than the value of the thermal expansion coefficient of the pure water.