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Determination of protonation constants for 2-hydroxy-1-(2-hydroxy-4-sulpho-1-naphthylazo)-3-napthoic acid

Authors:

JA Liyanage ,

Department of Chemistry, University of Kelaniya, Kelaniya, LK
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TK Janaratne

Department of Chemistry, University of Kelaniya, Kelaniya, LK
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Abstract

Chemical speciation modelling in combination with potentiometric titration method was used to determine the protonation constants for 2-hydroxy-1-(2-hydroxy-4-sulpho-1-naphthylazo)-3-naphthoic acid, the Patton and Reeder's reagent, at 25° C in three ionic strengths of 0.1 mol dm-3, 0.01 mol dm-3 and 0.001 mol dm-3 NaNO3. Potentiometric titrations were performed and pH, titrant volume, temperature and free and total proton concentrations at each titration point were measured. Constants were determined for three of the four protonated sites and the forth one being a very low value as this site is always in the ionic form and is readily ionized in aqueous solutions.

Keywords: Patton and Reeder; Protonation constants; Potentiometric titrations; Chemical speciation modelling

DOI: 10.4038/josuk.v3i0.2737

J. Sci. Univ. Kelaniya 3 (2007) : 47-52
DOI: http://doi.org/10.4038/josuk.v3i0.2737
How to Cite: Liyanage, J. & Janaratne, T., (2011). Determination of protonation constants for 2-hydroxy-1-(2-hydroxy-4-sulpho-1-naphthylazo)-3-napthoic acid. Journal of Science of the University of Kelaniya Sri Lanka. 3, pp.47–52. DOI: http://doi.org/10.4038/josuk.v3i0.2737
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Published on 24 Jan 2011.
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