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  Home > JCE Print > Journal of Chemical Education > Issues > 2002  > January  >
Chemistry for Everyone
Tick Tock, a Vitamin C Clock
Stephen W. Wright
Pfizer Global Research and Development, Groton, CT 06340
Cover
January 2002
Vol. 79 No. 1
p. 40A
Abstract
An iodine clock reaction that gives a colorless to black result similar to that of the familiar Landolt iodate-bisulfite clock reaction is described. The vitamin C clock reaction uses chemicals that are readily available on the retail market: vitamin C, tincture of iodine, 3% hydrogen peroxide, and laundry starch. Orange juice may be used as the vitamin C source to give an orange to black reaction.
Supplement
Videos of the vitamin C tablet and orange juice versions of the clock reaction are available.
More Information
*  Citation
 Wright, Stephen W. J. Chem. Educ. 2002 79 40A.
*  Keywords
 Consumer Chemistry; Elementary / Middle School Science; General Chemistry; Introductory / High School Chemistry; Iodine; Outreach; Redox Reactions; Teaching / Learning Aids; Vitamins
*  History
 Created:
Last Updated:		 December 3, 2001
March 16, 2005
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