Journal
ANALYTICA CHIMICA ACTA
Volume 455, Issue 2, Pages 335-342Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0003-2670(01)01623-3
Keywords
4-(2-pyridylazo)resorcinol; principal components; DATAN; acidity constants; binary solvents; solvent mixtures
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The acidity constants of 4-(2-pyridylazo)resorcinol (PAR, Scheme 1) in binary mixtures of methanol-water at 25 degreesC and an ionic strength of 0.1 M have been determined spectrophotometrically. DATa ANalysis (DATAN) program applied for determination of acidity constants. As percent of methanol increases in solvent mixtures the pK(a) constants also increased. There is linear relationship between acidity constants and the mole fraction of methanol in the solvent mixtures. Effect of solvent composition on acidity constants and pure spectrum of each component are also discussed. (C) 2002 Elsevier Science B.V. All rights reserved.
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