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  Home > JCE Print > Journal of Chemical Education > Issues > 2003  > November  >
Information, Textbooks, Media, Resources
Solubility Rules: Three Suggestions for Improved Understanding
Bob Blake
Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX 79409
Cover
November 2003
Vol. 80 No. 11
p. 1348
Abstract
This article examines the precipitation and solubility of ionic compounds in water from seven general chemistry textbooks and the CRC Handbook of Chemistry and Physics. Many general chemistry textbooks have errors or omissions in their rules for predicting solubility that the author highlights and attempts to correct. In addition, it is proposed that the following changes be made to the discussion of solubility so that students and teachers can have a greater understanding of solubility: (i) Solubility should not be presented in a strictly dualistic manner of soluble versus insoluble. Examples of real solubility data should be given such that readers understand that degrees of solubility are possible. (ii) If one desires to classify salts as soluble or insoluble in water, the criteria for this classification should be made clear. (iii) Solubility should be explained in terms of simple physical principles. A single rule for solubility is presented that is almost as accurate as the sets of rules presented in most textbooks.
More Information
*  Citation
 Blake, Bob. J. Chem. Educ. 2003 80 1348.
*  Keywords
 Aqueous Solution Chemistry; Descriptive Chemistry; General Chemistry; Inorganic Chemistry; Introductory / High School Chemistry; Qualitative Analysis; Textbooks
*  History
 Created:
Last Updated:		 October 2, 2003
February 28, 2005
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