Enthalpy of Vaporization and Vapor Pressures: An Inexpensive Apparatus

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 calibr...

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Bibliographic Details
Published in:Journal of chemical education 2007-05, Vol.84 (5), p.822
Main Authors: Battino, Rubin, Dolson, David A, Hall, Michael R, Letcher, Trevor M
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Energy
Enthalpy
Laboratory Equipment
Laboratory Experiments
Measurement
Physics
Science education
Science Experiments
Science Instruction
Scientific apparatus & instruments
Temperature
Temperature sensors
Thermodynamics
Vapor pressure
Vaporization
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Summary: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.
ISSN:0021-9584
1938-1328
DOI:10.1021/ed084p822