Spectrophotometric Determination of Acidity Constants of 4‐(2‐Pyridylazo) Resorcinol in Various Micellar Media Solutions |
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Authors: | Jahanbakhsh Ghasemi Hossein Peyman Ali Niazi |
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Affiliation: | 1. Department of Chemistry, Faculty of Sciences, Razi University, Kermanshah, Iran;2. Department of Chemistry, Faculty of Sciences, Azad University of Arak, Arak, Iran |
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Abstract: | 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 KNO3. 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 pKa 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. |
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Keywords: | Acidity constant PAR Anionic surfactant Neutral surfactant DATAN Spectrophotometric |
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