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Measuring P–V–T Phase Behavior with a Variable Volume View Cell

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Markus M. Hoffmann and Jason D. Salter

Department of Chemistry, State University of New York College at Brockport, Brockport, NY 14420

J. Chem. Educ., 2004, 81 (3), p 411

DOI: 10.1021/ed081p411

Publication Date (Web): March 1, 2004

Section:

History, Education, and Documentation

Abstract

An experiment for the undergraduate physical chemistry laboratory is presented. Isotherms are measured on the pressure–volume–temperature (P–V–T ) surface of a pure fluid, such as carbon dioxide. A variable volume view cell is made from a modified commercial syringe pump. The instrument also allows for observation of the critical opalescence. Students use the data to construct the portion of the vapor pressure curve near the critical point of the substance and obtain the changes in volume, ΔV(T), entropy, ΔS(T), and enthalpy ΔH(T) for the observed phase transitions.

Keywords (Audience):

Upper-Division Undergraduate

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).

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  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 ...
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