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A Student Experiment in Non-Isothermal Chemical Kinetics

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Steven C. Hodgson , Lawrence N. Ngeh , John D. Orbell and Stephen W. Bigger

School of Life Sciences and Technology, Victoria University of Technology, St. Albans Campus, MCMC, Melbourne, 8001, Australia

J. Chem. Educ., 1998, 75 (9), p 1150

DOI: 10.1021/ed075p1150

Publication Date (Web): September 1, 1998

Section:

History, Education, and Documentation

Abstract

An advanced level experiment in physical chemistry is described in which the kinetics of the reaction between aqueous bromine and formic acid are studied spectrophotometrically under non-isothermal, pseudo-first order conditions. A dynamic temperature profile is achieved conveniently by heating the reactants prior to mixing and allowing the reaction mixture to cool in accordance with Newton's law of cooling. The equations describing the time- dependence of the rate constant obtained under the imposed temperature profile are derived and a method is described for processing the experimentally obtained data. The activation energy of the reaction is determined from a plot of the processed data.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Physical Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Bromine

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