title: The use of approximation formulae in calculations of acid-base equilibria-III: mixtures of mono- or diprotic acids and their salts.
abstract: 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).
authors.affiliation: Department of Chemistry, Faculty of Science, Saitama University, Shimo-Okubo, Urawa 338, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Narasaki