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  Home > JCE Print > Journal of Chemical Education > Issues > 2005  > February  >
In the Classroom
JCE DigiDemos: Tested Demonstrations
Fractional Distillation of Air and Other Demonstrations with Condensed Gases
Maria Oliver-Hoyo and William L. Switzer, III
Department of Chemistry, North Carolina State University, Raleigh, NC 27695

checked by Robert Eierman
Department of Chemistry, University of Wisconsin–Eau Claire, Eau Claire, WI 54701

Cover
February 2005
Vol. 82 No. 2
p. 251
Abstract
This demonstration builds upon the commonly performed liquefaction of air not only to show the presence of nitrogen and oxygen, but also the presence of two other components, carbon dioxide and water. Several extensions are suggested: one to show boiling point elevation in solution and another to show the elevation of both boiling point and sublimation point with pressure. No special apparatus is required permitting presentations to audiences in a variety of settings. These demonstrations give the opportunity to discuss properties of gases, solution chemistry, and phase equilibria. Special emphasis is given to the conceptual explanations of the processes involved.
More Information
*  Citation
 Oliver-Hoyo, Maria; Switzer, William L., III. J. Chem. Educ. 2005 82 251.
*  Keywords
 Demonstrations; Gases; General Chemistry; Qualitative Analysis
*  History
 Created:
Last Updated:		 January 4, 2005
January 14, 2005
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