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 [1]
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[1] Pennsylvania State University
Pennsylvania State University
Borough of State College, Estados Unidos
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- Localización: Journal of chemical education, ISSN 0021-9584, Vol. 73, Nº 10 (October), 1996, págs. 967-970
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
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Resumen
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.
