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  Home > JCE Print > Journal of Chemical Education > Issues > 1999  > April  >
In the Classroom
Tested Demonstrations
Using Large Glass Cylinders To Demonstrate Chemical Reactions
submitted by: Wobbe de Vos
Centre for Science and Mathematics Education, University of Utrecht, Utrecht, The Netherlands

checked by: Kim Kostka
Department of Chemistry, University of Wisconsin-Rock County, Janesville, WI 53546

Cover
April 1999
Vol. 76 No. 4
p. 528
Abstract
This article describes a simple laboratory experiment that aims at pedagogic as well as aesthetic aspects of chemical reactions. In a 0.5- or 1-liter glass cylinder almost completely filled with water, a slow precipitation reaction involving two soluble salts is made to occur by adding a sample of one salt directly to the water and then placing some of the second salt in a filter inside a funnel that has been placed on top of the cylinder. Whereas setting up the experiment takes only a few minutes, the reaction may go on for an hour or more, displaying a slow but continuous formation process. The same set up can be used for a variety of redox, complex formation, and other reactions that produce a visible effect. Several concrete examples are given. Experiments of this type have a high educational potential as students have the opportunity to observe the actual formation of a precipitate instead of just being able to see the result. The experiment is also suitable for demonstrating some of the fascinating beauty of chemical reactions to the general public.

Featured on the Cover
More Information
*  Citation
 de Vos, Wobbe. J. Chem. Educ. 1999 76 528.
*  Keywords
 Demonstrations; Introductory / High School Chemistry; Laboratory Equipment / Apparatus; Public Understanding; Aqueous Solution Chemistry
*  History
 Created:
Last Updated:		 June 14, 1999
June 23, 2005
Link to Cover added (April 2004).
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  Home > JCE Print > Journal of Chemical Education > Issues > 1999 > April > Page 528


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