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  Home > JCE Print > Journal of Chemical Education > Issues > 1995  > November  >
Secondary School Chemistry
Filtrates and Residues
Crystallization of Supersaturated Sodium Acetate and the Temperature Dependence of the Autoionization Constant of Water
Joseph A. Pergler, Ronald O. Ragsdale, and Thomas G. Richmond
University of Utah, Salt Lake City, UT 84112
Cover
November 1995
Vol. 72 No. 11
p. 1027
Abstract
The temperature rise caused by the exothermic crystallization of a supersaturated solution of sodium acetate is visualized by performing the crystallization in the presence of phenolphthalein. As the solution warms to near 50 oC, a distinct pink color appears. Heating the solution to 90 oC affords a brilliant pink color. Quantitative spectroscopic measurements at 554 nm as a function of temperature shows that the absorbance obeys a van't Hoff relationship. The color change is ascribed to the variation of Kw (and thus the derived hydrolysis constant Kb for acetate ion) with temperature.
More Information
*  Citation
 Pergler, Joseph A.; Ragsdale, Ronald O.; Richmond, Thomas G. J. Chem. Educ. 1995 72 1027.
*  Keywords
*  History
 Created:
Last Updated:		 10/1/1999
5/22/2006
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