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  Home > JCE Print > Journal of Chemical Education > Issues > 1998  > September  >
In the Laboratory
Raoult's Law: Binary Liquid-Vapor Phase Diagrams: A Simple Physical Chemistry Experiment
Roger W. Kugel
Department of Chemistry, St. Mary's University of Minnesota, Winona, MN 55987
Cover
September 1998
Vol. 75 No. 9
p. 1125
Abstract
A new physical chemistry laboratory experiment illustrating Raoult's law behavior of ideal solutions is described. The vapor composition of binary mixtures of a ketone and an aromatic solvent is measured spectrophotometrically and the results used to generate Raoult's law vapor pressure plots and binary liquid-vapor phase diagrams. The method is more straightforward and experimentally easier to carry out than the traditional distillation techniques. Student results are presented for ortho-xylene/acetone and ortho-xylene/methyl isobutyl ketone mixtures. Both of these solutions show slight positive deviations from Raoult's law. The results are discussed in terms of the intermolecular interactions occurring in the mixtures.
More Information
*  Citation
 Kugel, Roger W. J. Chem. Educ. 1998 75 1125.
*  Keywords
 instrumental methods, physical chem, solutions, solvents, phase transitions, diagrams, uv-vis spectroscopy
*  History
 Created:
Last Updated:		 June 21, 1999
June 24, 2005
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