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  Home > JCE Print > Journal of Chemical Education > Issues > 2004  > March  >
In the Laboratory
Measuring P–V–T Phase Behavior with a Variable Volume View Cell
Markus M. Hoffmann and Jason D. Salter
Department of Chemistry, State University of New York College at Brockport, Brockport, NY 14420
Cover
March 2004
Vol. 81 No. 3
p. 411
Abstract
An experiment for the undergraduate physical chemistry laboratory is presented. Isotherms are measured on the pressure–volume–temperature (P–V–T ) surface of a pure fluid, such as carbon dioxide. A variable volume view cell is made from a modified commercial syringe pump. The instrument also allows for observation of the critical opalescence. Students use the data to construct the portion of the vapor pressure curve near the critical point of the substance and obtain the changes in volume, ΔV(T), entropy, ΔS(T), and enthalpy ΔH(T) for the observed phase transitions.
Supplement
A handout for students and extensive notes for the instructor are available.
*  Contents JCE2004p0411W.doc (Microsoft Word)
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More Information
*  Citation
 Hoffmann, Markus M.; Salter, Jason D. J. Chem. Educ. 2004 81 411.
*  Keywords
 Gases; Laboratory Equipment / Apparatus; Laboratory Instruction; Phase Transitions / Diagrams; Physical Chemistry; Thermodynamics
*  History
 Created:
Last Updated:		 February 3, 2004
February 18, 2005
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