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A Convenient, Inexpensive, and Environmentally Friendly Method of Measuring the Vapor Pressure of a Liquid as a Function of Temperature

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James H. Burness

Department of Chemistry, The Pennsylvania State University, York Campus, 1031 Edgecomb Ave., York, PA 17403-3398

J. Chem. Educ., 1996, 73 (10), p 967

DOI: 10.1021/ed073p967

Publication Date (Web): October 1, 1996

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.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Physical Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Laboratory Equipment / Apparatus

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This article has been cited by 4 ACS Journal articles (4 most recent appear below).

Modern Developments in the Physical Chemistry Laboratory
Samuel A. Abrash
2007 973 (), 115-151
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  2007 973 (), 115-151
  Developments in the physical chemistry laboratory since the publication of the germinal text by Schwenz and Moore (1) are categorized and reviewed. The categories examined include modern instrumentation, current topics in chemistry, integrated ...
  Abstract | Hi-Res PDF | PDF w/ Links
Enthalpy of Vaporization and Vapor Pressures: An Inexpensive Apparatus
Rubin Battino , David A. Dolson and Michael R. Hall , Trevor M. Letcher
Journal of Chemical Education2007 84 (5), 822
- Enthalpy of Vaporization and Vapor Pressures: An Inexpensive Apparatus
  Rubin Battino , David A. Dolson and Michael R. Hall , Trevor M. Letcher
  Journal of Chemical Education2007 84 (5), 822
  An inexpensive apparatus is described for the determination of the vapor pressure of a liquid as a function of temperature for the purpose of calculating enthalpy changes of vaporization. The solid-state pressure transducer is linear above 100 torr, is ...
  Abstract | Hi-Res PDF | PDF w/ Links
Teaching Physical Chemistry Experiments with a Computer Simulation by LabVIEW
A. Belletti , R. Borromei and G. Ingletto
Journal of Chemical Education2006 83 (9), 1353
- Teaching Physical Chemistry Experiments with a Computer Simulation by LabVIEW
  A. Belletti , R. Borromei and G. Ingletto
  Journal of Chemical Education2006 83 (9), 1353
  This article reports the results obtained using a computer program developed with the software LabVIEW. The program is a computer simulation of the physical chemistry experiment regarding the vapor pressure measurements of a pure liquid as a function of ...
  Abstract | Hi-Res PDF | PDF w/ Links
An Inexpensive Microscale Method for Measuring Vapor Pressure, Associated Thermodynamic Variables, and Molecular Weight
Jason C. DeMuro , Hovanes Margarian , Artavan Mkhikian , Kwang Hi No and Andrew R. Peterson
Journal of Chemical Education1999 76 (8), 1113
- An Inexpensive Microscale Method for Measuring Vapor Pressure, Associated Thermodynamic Variables, and Molecular Weight
  Jason C. DeMuro , Hovanes Margarian , Artavan Mkhikian , Kwang Hi No and Andrew R. Peterson
  Journal of Chemical Education1999 76 (8), 1113
  Existing methods for measuring vapor pressure are too expensive or not quantitative enough for chemistry classes in secondary schools. Our method measures the vapor pressure inside a bubble trapped in a graduated microtube made from a disposable 1-mL ...
  Abstract | Hi-Res PDF | PDF w/ Links