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Spectrophotometric determination of the dissociation constants of 4-(p-nitrophenyl-azo)-8-hydroxy-quinoline

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Summary

Absorption spectra of 4-(p-nitrophenyl-azo)-8-hydroxy-quinoline (NQOH) in the visible region was studied at different pH values in the range 4–12. NQOH exhibited two absorption maxima, one at λ = 480 mμ in acid solution and the other at λ = 600 mμ in alkaline solution. The absorption at λ = 600 mμ was markedly variant with the pH of the solution; the data indicated two dissociation processes presumably due to the ampholytic character of NQOH

with 7·3 and 8·1 for pK b and pK a referring in acidic and basic dissociation processes, respectively. The optical density values calculated from these constants agreed closely with the observed data.

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Authors and Affiliations

  1. Department of Physical Chemistry, Indian Institute of Sugar Technology, Kanpur

    N. A. Ramaiah & V. Sundara Raman

Authors
  1. N. A. Ramaiah
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  2. V. Sundara Raman
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Additional information

Communicated by K. S. G. Doss, F.A.SC.

A preliminary note was published inNaturwiss., 1956,43, 179.

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Ramaiah, N.A., Raman, V.S. Spectrophotometric determination of the dissociation constants of 4-(p-nitrophenyl-azo)-8-hydroxy-quinoline. Proc. Indian Acad. Sci. 44, 90–95 (1956). https://doi.org/10.1007/BF03048806

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  • DOI: https://doi.org/10.1007/BF03048806

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