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Carbon Dioxide Dissolution as a Relaxation Process: A Kinetics Experiment for Physical Chemistry

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Peter G. Bowers , Mordecai B. Rubin , Richard M. Noyes and Dagmar Andueza

Simmons College, Department of Chemistry, 300 The Fenway, Boston, MA 02115

J. Chem. Educ., 1997, 74 (12), p 1455

DOI: 10.1021/ed074p1455

Publication Date (Web): December 1, 1997

Section:

History, Education, and Documentation

Abstract

When a closed system consisting of gaseous CO₂ in equilibrium with a well-stirred saturated aqueous solution at room temperature is perturbed by removing or adding CO₂ gas, the system returns to equilibrium with a characteristic relaxation time of about 20 minutes depending on the apparatus geometry. We describe a simple experiment to measure the kinetics of the relaxation by monitoring the pressure changes above the solution. The dissolution demonstrates all the features of much faster relaxation processes that require costly instrumentation to study, and has the advantage of yielding information about an environmentally and industrially important process, many aspects of which are still poorly understood. In addition, the experiment presents an opportunity to discuss the dynamics of interphase molecular transfer, a topic not usually treated in physical chemistry texts.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Physical Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Carbon

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