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  Home > JCE Print > Journal of Chemical Education > Issues > 2006  > August  >
In the Classroom
Overhead Projector Demonstrations
A Colorful Look at the Chelate Effect
Donald C. Bowman
Department of Science, Math and Engineering, Central Virginia Community College, Lynchburg, VA 24502
Cover
August 2006
Vol. 83 No. 8
p. 1158
Abstract
The relative stabilities of a number of copper(II) and nickel(II) complexes are visually compared by noting color changes that result from ligand exchange reactions. The demonstration illustrates the chelate effect: the increased stability of bidentate ligands over monodentate ligands and in one case, the increased stability of a tetradentate ligand over a bidentate ligand. By carrying out the reactions on an overhead projector, they can be shown to a larger audience of students. The roles that enthalpy and entropy play in the chelate effect are discussed.

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Digital pictures of the solutions of the complex ions formed in the demonstration are available.
*  Contents Folder JCE2006p1158W containing JCE2006p1158W_1.tif and JCE2006p1158W_2.tif (image files)
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*  Citation
 Bowman, Donald C. J. Chem. Educ. 2006 83 1158.
*  Keywords
 Coordination Compounds; Demonstrations; First-Year Undergraduate / General; High School / Introductory Chemistry; Transition Elements
*  History
 Created:
Last Updated:		 6/21/2006
6/30/2006
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