The use of approximation formulae in calculations of acid-base equilibria-III: mixtures of mono- or diprotic acids and their salts.
The pH of mixtures of mono- or diprotic acids and their salts 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. The regions become narrower as the concentrations of the mixtures decrease. In diprotic butters most ranges may be calculated by the quadratic approximation formulae if K(2)/K(1), is less than 10(-4).
Narasaki
H
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Department of Chemistry, Faculty of Science, Saitama University, Shimo-Okubo, Urawa 338, Japan.