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Tick Tock, a Vitamin C Clock

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Stephen W. Wright

Pfizer Global Research and Development, Groton, CT 06340

J. Chem. Educ., 2002, 79 (1), p 40A

DOI: 10.1021/ed079p40A

Publication Date (Web): January 1, 2002

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.

Keywords (Audience):

Elementary / Middle School Science

Keywords (Domain):

Public Understanding / Outreach

Keywords (Feature):

JCE Classroom Activity

Keywords (Pedagogy):

Inquiry-Based / Discovery Learning

Keywords (Subject):

Consumer Chemistry

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Citing Articles

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This article has been cited by 2 ACS Journal articles (2 most recent appear below).

A Student Laboratory Experiment Based on the Vitamin C Clock Reaction
Ed Vitz
Journal of Chemical Education2007 84 (7), 1156
- A Student Laboratory Experiment Based on the Vitamin C Clock Reaction
  Ed Vitz
  Journal of Chemical Education2007 84 (7), 1156
  We have adapted the vitamin C clock reaction to a student laboratory experiment in which the orders with respect to peroxide and iodide, the rate constant, and the activation energy are determined by the method of initial rates. Rates of the oxidation of ...
  Abstract | Hi-Res PDF | PDF w/ Links
An Iodine Fluorescence Quenching Clock Reaction
Richard B. Weinberg , Mark Muyskens
Journal of Chemical Education2007 84 (5), 797
- An Iodine Fluorescence Quenching Clock Reaction
  Richard B. Weinberg , Mark Muyskens
  Journal of Chemical Education2007 84 (5), 797
  A fluorescent clock reaction is described that is based on the principles of the Landolt iodine reaction but uses the potent fluorescence quenching properties of triiodide to abruptly extinguish the ultraviolet fluorescence of optical brighteners present ...
  Abstract | Hi-Res PDF | PDF w/ Links