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
J. Chem. Educ., 2007, 84 (3), p 520
DOI: 10.1021/ed084p520
Publication Date (Web): March 1, 2007
History, Education, and Documentation

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.

Keywords (Audience):

Second-Year Undergraduate

Keywords (Domain):

Chemical Education Research

Keywords (Feature):

Research: Science and Education

Keywords (Pedagogy):

Problem Solving / Decision Making

Keywords (Subject):

Aqueous Solution Chemistry
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  • Received: August 03, 2009

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