Publication: Clock Reaction Revisited: Catalyzed Redox Substrate-Depletive Reactions
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Issued Date
2019-04-09
Resource Type
ISSN
19381328
00219584
00219584
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2-s2.0-85062081892
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Mahidol University
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SCOPUS
Bibliographic Citation
Journal of Chemical Education. Vol.96, No.4 (2019), 812-818
Suggested Citation
Taweetham Limpanuparb, Chattarin Ruchawapol, Dulyarat Sathainthammanee Clock Reaction Revisited: Catalyzed Redox Substrate-Depletive Reactions. Journal of Chemical Education. Vol.96, No.4 (2019), 812-818. doi:10.1021/acs.jchemed.8b00547 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/50571
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Clock Reaction Revisited: Catalyzed Redox Substrate-Depletive Reactions
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Abstract
© 2019 American Chemical Society and Division of Chemical Education, Inc. Quantitative demonstration of chemical kinetics often requires sophisticated equipment and materials. By using inexpensive and commonly available chemicals, we propose here two clock reactions, oxygen-safranin-benzoin clock and cysteine-iodine-hydrogen peroxide clock. Students simply measure and add stock solutions to start clock reactions. Sudden discoloration or coloration of the reaction mixture marks the end of the reaction, and this can be conveniently timed. Students then complete calculations and graphing in a spreadsheet file by following common protocols. Rates of reaction are calculated from the ratio of [limiting reactant] 0 and clock time. Orders of reactions and rate constants are determined by the method of initial rate. Additional discussions on topics such as catalysis, reaction mechanism, redox reaction, and pseudo-zeroth-order reaction are also possible.