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UV-visible spectrum of nitrous acid in solution: pKa determination and analytical applications

✍ Scribed by Maria das Graças Gomes; Simone da S.S. Borges; Luiz G.F. Lopes; Douglas Wagner Franco

Book ID
102624285
Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
365 KB
Volume
282
Category
Article
ISSN
0003-2670

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✦ Synopsis

The UV-visible spectra of nitrous acid in four different solvents were obtained. The hyperfine structure observed in all these spectra was tentatively attributed to vibrational coupling. The unique characteristics of the nitrous acid spectrum in acidic solution allowed the detection and determination of 3.0 x 10e4 mol l-' nitrite in the presence of 0.1 mol 1-t nitrate solution. Through spectrophotometric and potentiometric measurements, the pK, value for nitrous acid was calculated to be 2.3 f 0.2.

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