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Enthalpy of Vaporization and Vapor Pressures: An Inexpensive Apparatus

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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

J. Chem. Educ., 2007, 84 (5), p 822

DOI: 10.1021/ed084p822

Publication Date (Web): May 1, 2007

Section:

History, Education, and Documentation

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.

Keywords (Audience):

First-Year Undergraduate / General

Keywords (Domain):

Laboratory Instruction

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Gases

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This article has been cited by 1 ACS Journal articles (1 most recent appear below).

Vapor Pressure Plus: An Experiment for Studying Phase Equilibria in Water, with Observation of Supercooling, Spontaneous Freezing, and the Triple Point
Joel Tellinghuisen
Journal of Chemical Education2010 87 (6), 619-622
- Vapor Pressure Plus: An Experiment for Studying Phase Equilibria in Water, with Observation of Supercooling, Spontaneous Freezing, and the Triple Point
  Joel Tellinghuisen
  Journal of Chemical Education2010 87 (6), 619-622
  Liquid−vapor, solid−vapor, and solid−liquid−vapor equilibria are studied for the pure substance water, using modern equipment that includes specially fabricated glass cells. Samples are evaporatively frozen initially, during which they typically supercool ...
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