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  Home > JCE Print > Journal of Chemical Education > Issues > 2007  > March  >
Research: Science and Education
Predominance Diagrams, a Useful Tool for the Correlation of the Precipitation–Solubility Equilibrium with Other Ionic Equilibria
Constantino Fernández Pereira, Manuel Alcalde, Rosario Villegas, and José Vale
E.S. Ingenieros Industriales, Departamento de Ingeniería Química y Ambiental, Universidad de Sevilla, E-4102 Sevilla, Spain
Cover
March 2007
Vol. 84 No. 3
p. 520
Abstract
The four types of ionic equilibria—acid–base, redox, precipitation, and complexation—have certain similarities, which has led some authors to develop a unified treatment of them. These authors have highlighted the common aspects and tried to find a systemization of the equilibria that would facilitate learning them. In this unified treatment, ionic reactions are interpreted as particle exchanges—involving protons, electrons, or ligands—between a donor and an acceptor of two conjugate pairs. The unified treatment proposes a graphic solution to the equilibria problems, using diagrams that employ the logarithm of the concentration of the exchanged particle as the variable. This paper presents the application of the precipitation–solubility equilibrium and describes the usefulness of such diagrams for solving solubility problems.
More Information
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Citation
Pereira, Constantino Fernández; Alcalde, Manuel; Villegas, Rosario; Vale, José. J. Chem. Educ. 2007 84 520.
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Keywords
Aqueous Solution Chemistry; Chemical Education Research; Equilibrium; Precipitation / Solubility; Problem Solving / Decision Making; Second-Year Undergraduate; Water / Water Chemistry
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History
Created:
Last Updated:
2/1/2007
2/22/2007
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