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  Home > JCE Print > Journal of Chemical Education > Issues > 1996  > July  >
Features
Tested Demonstrations
Visible Ion Exchange Demonstration for Large or Small Lecture Halls
Jerry A. Driscoll
Department of Chemistry, University of Utah, Salt Lake City, UT 84112
Cover
July 1996
Vol. 73 No. 7
p. 639
Abstract
This demonstration is a colorful illustration of how an ion exchange column works (1). On a Dowex 50w-X8 ion exchange resin (H+ form of the copolymer sulfonated styrene and p-divinyl benzene), the column is washed with distilled water until the water tests negative for ions with a conductivity apparatus and the pH is the same as the distilled water used for the washing. Then 10 to 20 mL of 1.0 M copper (II) sulfate is added to the column. While draining the column, more distilled water is added, illustrating that the green copper ion does not migrate down the column. The eluant is collected and tested for H+ and SO42- ions respectively with an acid-base indicator and a barium solution. The students will conclude that the copper ion replaced the hydrogen ions. The column is recharged with hydrochloric acid, thus illustrating that the copper ion is being leached off the column and collected in the eluant. The eluant may be green in the presence of high chloride ion concentration forming the yellow tetrachlorocuprate (-2) ion in favor of the blue hexaaquocopper (II) ion. The column is then washed with distilled water and stored under water for the next time it is to be used.

References

  1. Egen, N; Ford, P. C. J. Chem. Educ. 1976, 53, 302-303.
More Information
*  Citation
 Driscoll, Jerry A. J. Chem. Educ. 1996 73 639.
*  Keywords
*  History
 Created:
Last Updated:		 9/23/1999
5/22/2006
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