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  Home > JCE Print > Journal of Chemical Education > Issues > 2000  > September  >
In the Laboratory
Gas-Phase Kinetics of O3 + C2H2 and O3 + H2C=CCl2
Joel D. Burley and Alisa M. Roberts
Department of Chemistry, Saint Mary's College of California, Moraga, CA 94575-4527
Cover
September 2000
Vol. 77 No. 9
p. 1210
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.
Supplement
Instructor notes and a laboratory handout for students are available.
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*  Citation
 Burley, Joel D.; Roberts, Alisa M. J. Chem. Educ. 2000 77 1210.
*  Keywords
 Laboratory Instruction; Physical Chemistry; Atmospheric Chemistry; Gases; Kinetics
*  History
 Created:
Last Updated:		 August 29, 2000
August 31, 2005
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