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  Home > JCE Print > Journal of Chemical Education > Issues > 2007  > May  >
In the Laboratory
Cost-Effective Teacher
Enthalpy of Vaporization and Vapor Pressures: An Inexpensive Apparatus
Rubin Battino, David A. Dolson, and Michael R. Hall
Department of Chemistry, Wright State University, Dayton, OH 45435

Trevor M. Letcher
Department of Chemistry, University of KwaZulu-Natal, 4041 Durban, South Africa

Cover
May 2007
Vol. 84 No. 5
p. 822
Abstract
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 useful in the range -40 to 85 °C, and is calibrated using pure water. The experimental enthalpies of vaporization for ten solvents are within ca. 0 to 13% of literature values. Two different versions of the static vapor pressure apparatus are described. Also described are a simple air thermostat and an inexpensive temperature controller (±0.1 K) based on an integrated temperature sensor. The measurement time is under three hours.
More Information
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Citation
Battino, Rubin; Dolson, David A.; Hall, Michael R.; Letcher, Trevor M. J. Chem. Educ. 2007, 84, 822.
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Keywords
First-Year Undergraduate / General; Gases; Hands-On Learning / Manipulatives; Laboratory Equipment / Apparatus; Laboratory Instruction; Lipids; Liquids; Phases / Phase Transitions / Diagrams; Physical Chemistry; Physical Properties; Second-Year Undergraduate; Thermodynamics
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History
Created:
Last Updated:
3/22/2007
3/27/2007
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Experiments, laboratory exercises, lecture demonstrations, and other descriptions of the use of chemicals, apparatus, instruments, computers, and computer interfaces are presented in the Journal of Chemical Education as illustrative of new or improved ideas or concepts in chemistry instruction and are directed at qualified teachers. Although every effort is made to assure and encourage safe practices and safe use of chemicals, the Journal of Chemical Education cannot assume responsibility for uses made of its published materials. Many chemicals are hazardous. Precautions for the safe use of hazardous chemicals and directions for their proper disposal are described in the Material Safety Data Sheets and on the labels. We strongly urge all those planning to use materials from our pages to make choices and to develop procedures for laboratory and classroom safety in accordance with local needs and situations.
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