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  Home > JCE Print > Journal of Chemical Education > Issues > 1996  > October  >
In the Laboratory
A Convenient, Inexpensive, and Environmentally Friendly Method of Measuring the Vapor Pressure of a Liquid as a Function of Temperature
James H. Burness
Department of Chemistry, The Pennsylvania State University, York Campus, 1031 Edgecomb Ave., York, PA 17403-3398
Cover
October 1996
Vol. 73 No. 10
p. 967
Abstract
The popular experiment in which students measure the vapor pressure of a liquid as a function of temperature has been modified by introducing the use of a hand-held vacuum pump. This inexpensive modification not only eliminates the need to use mercury manometers and water aspirators, but it also makes the experimental apparatus much simpler and allows more data points to be collected during the three-hour lab period. Enthapies of vaporization and normal boiling points for the unknown samples, determined from the data by use of the Clausius-Clapeyron equation, are usually within approximately 5% of the actual values. This paper describes the experimental procedure and setup needed for the revised experiment and compares the accuracy and precision of the data collected by both the original and the modified procedures.
More Information
*  Citation
 Burness, James H. J. Chem. Educ. 1996 73 967.
*  Keywords
 Physical Chemistry
*  History
 Created:
Last Updated:		 September 22, 1999
February 21, 2006
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