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1997
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Chemical Education Today
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Letters
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Stable Solutions for the Iodine Clock Reaction
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George B. Kauffman and Charles R. Hall
California State University, Fresno, Fresno, CA 93740-0070
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June 1997
Vol. 74 No. 6
p. 616
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| Full Text |
The instability that has prevented the advance preparation of large quantities of solutions for a reproducible iodine clock reaction has led to modifications by Conway (1), Alyea (2), Kauffman and Hall (3), and most recently, Mitchell (4). In our modification of the solutions originally proposed by Alyea (5), instead of adding the sulfuric acid to the
sodium sulfite-starch solution, we either added the acid to the potassium iodate solution or added it separately at the time of the demonstration as a third solution. In both cases, after standing for about a year in tightly closed containers, these solutions still produce instantaneous color changes.
Literature Cited
- Conway, W. J. J. Chem. Educ. 1940, 6, 398.
- Tested Demonstrations in Chemistry; Alyea, H. N.; Dutton, F. B.,
Eds.; Journal of Chemical Education: Easton, PA, 1965; p 130.
- Kauffman, G. B.; Hall, C. R. J. Chem. Educ. 1958, 35, 577.
- Mitchell, R. S. J. Chem. Educ. 1996, 73, 783.
- Alyea, H. N. J. Chem. Educ. 1955, 32, 9; Tested Demonstrations
in Chemistry; Alyea, H. N.; Dutton, F. B., Eds.; Journal of Chemical Education: Easton, PA, 1965; p 19.
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| More Information |
 Citation |
Kauffman, George B.; Hall, Charles R. J. Chem. Educ. 1997 74 616.
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History |
Created:
Last Updated: |
July 28, 1999
June 23, 2005
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Link to Article added (August 2004).
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June
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