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Gas-Phase Kinetics of O3 + C2H2 and O3 + H2C=CCl2

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Joel D. Burley and Alisa M. Roberts

Department of Chemistry, Saint Mary''s College of California, Moraga, CA 94575-4527

J. Chem. Educ., 2000, 77 (9), p 1210

DOI: 10.1021/ed077p1210

Publication Date (Web): September 1, 2000

Section:

History, Education, and Documentation

Abstract

Ozone plays a significant role in the troposphere by oxidizing many organic compounds. While reactions between O₃ and saturated hydrocarbons are very slow, reactions between O₃ and unsaturated hydrocarbons are sometimes fast enough to be atmospherically significant. This report describes an experiment for the physical chemistry laboratory that measures reaction rate constants for the ozone-acetylene and ozone-vinylidene chloride reactions and introduces students to some of the techniques and calculations used in gas-phase kinetics. The rate of reaction is measured spectrophotometrically by monitoring the decay of the very strong O₃ absorbance at 254 nm. A simple reaction cell is described that makes it possible to perform all necessary measurements with a standard UV-vis spectrophotometer. While results for acetylene appear to be perturbed by mixing artifacts (i.e., the rate at which the reactants mix in the reaction cell is too slow compared to the rate of the reaction), those for vinylidene chloride seem unaffected by mixing problems. A rate constant of 2.7 X 10^-21 cm³ molecule^-1 s^-1 is obtained for vinylidene chloride at 298 K, which is roughly consistent with the literature value of 3.7 X 10^-21 cm³ molecule^-1 s^-1.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Laboratory Instruction

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Atmospheric Chemistry

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

Modern Developments in the Physical Chemistry Laboratory
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  2007 973 (), 115-151
  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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