Abstract
The acid dissociation constants of methyl red, 4-nitrophenol, 4-nitrocatechol, and neutral red were studied in water and ethanol−water cosolvents and in the presence of β-cyclodextrin (β-CD). Apparent acidity constants of these acid−base indicators were derived using rank annihilation factor analysis on spectrophotometric data. Formation constants of complexes with β-CD for both acidic and basic forms were obtained by curve fitting. The effects of the solvent and inclusion complex on the acidity constant and the effects of the solvent on the inclusion of the investigated acids with β-CD are discussed.
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