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.
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