The use of approximation formulae in calculations of acid-base equilibria-II: salts of mono- and diprotic acids.
The pH of solutions of salts of mono- and diprotic acids is calculated by use of approximation formulae and the theoretically exact equations. The regions for useful application of the approximation formulae (error <0.02 pH) have been identified. For salts of monoprotic acids, areas are symmetrically equal to those of the acids. For salts of diprotic acids the ranges generally depend on K(2)/K(1).
Narasaki
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Department of Chemistry, Faculty of Science, Saitama University, Shimo-Okubo, Urawa 338, Japan.