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  Home > JCE Print > Journal of Chemical Education > Issues > 2005  > July  >
Information • Textbooks • Media • Resources
JCE SymMath: Symbolic Mathematics in Chemistry
Computing Liquid–Vapor Phase Diagrams for Non-Ideal Binary Mixtures
Franklin M. C. Chen
Department of Natural and Applied Science, University of Wisconsin–Green Bay, Green Bay, WI 54311
Cover
July 2005
Vol. 82 No. 7
p. 1100
Full Text
This Mathcad worksheet is intended to help students learn about determining vapor–liquid phase diagrams for ideal and non-ideal binary mixtures. The document starts with a brief review of chemical potential, activities, and the two component phase rule. The first task for students is to construct a binary boiling point diagram for the benzene-toluene pair of liquids. Seventeen exercises guide the students as they learn the thermodynamics concepts of activity and activity coefficients as related to boiling point phase diagrams. van Laar's theory is used to calculate solvent and solute's activity coefficients for non-ideal mixtures. The document concludes with construction of a binary phase boiling point diagram for a pair of liquids that form a non-ideal solution.

The boiling point phase diagram for propanol–water system with –x– for the liquid and –– for the vapor composition lines, respectively.

Supplement
Fully interactive computer algebra files are available in the JCE SymMath collection of the JCE Digital Library Only@JCE Online.
More Information
*  Citation
 Chen, Franklin M. C. J. Chem. Educ. 2005 82 1100.
*  Keywords
 Computer-Based Learning; Mathematics / Symbolic Mathematics; Phases / Phase Transitions / Diagrams; Physical Chemistry; Thermodynamics; Upper-Division Undergraduate
*  History
 Created:
Last Updated:		 May 31, 2005
June 8, 2005
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