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Spectrophotometric Determination of Acidity Constants of 4‐(2‐Pyridylazo) Resorcinol in Various Micellar Media Solutions
Author(s) -
Ghasemi Jahanbakhsh,
Peyman Hossein,
Niazi Ali
Publication year - 2007
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.200700156
Subject(s) - chemistry , triton x 100 , resorcinol , reagent , dissociation constant , ionic strength , pulmonary surfactant , aqueous solution , micellar solutions , dissociation (chemistry) , absorption spectroscopy , inorganic chemistry , nuclear chemistry , micelle , organic chemistry , biochemistry , receptor , physics , quantum mechanics
Dissociation equilibria of 4‐(2‐pyridylazo) resorcinol (PAR) in aqueous micellar solutions were determined spectrophotometrically at 25 °C and at the constant ionic strength I = 0.1 M KNO 3 . For this purpose, the effect of nonionic (Brij‐35, Triton X‐100, Triton X‐114, Triton X‐405), and anionic (SDS) surfactants on the absorption spectra of PAR at different pH values was studied. Results show that the p K a values and pure spectra of each species of PAR are influenced by percentages of a neutral and an anionic surfactant such as Brij‐35, Triton X‐100, Triton X‐114, Triton X‐405 and SDS, respectively, added to the solution of this reagent.