Standardization of potentiometric sensors and acid-base behaviour of a series of bases in nitrobenzene

Authors
Barron, D Buti, S Barbosa, J
Citation
D. Barron et al., Standardization of potentiometric sensors and acid-base behaviour of a series of bases in nitrobenzene, ANALYT CHIM, 403(1-2), 2000, pp. 349-354
Citations number
23
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences
Journal title
ANALYTICA CHIMICA ACTA
ISSN journal
00032670 → ACNP
Volume
403
Issue
1-2
Year of publication
2000
Pages
349 - 354
Database
ISI
SICI code
0003-2670(20000103)403:1-2<349:SOPSAA>2.0.ZU;2-6
Abstract
The dissociation constant of picric acid in nitrobenzene, pK(a) = 6.63, was established spectrophotometrically, and the standardization of potentiomet ric systems in this medium using picric acid titration is proposed as a sta ndard method. The acid-base equilibria of a series of bases in nitrobenzene were also studied. The PKHB+ values of the protonated bases of various str ucture were determined and compared with the PKHB+ values in water and acet onitrile in order to evaluate the resolution of acid strength in these medi a. (C) 2000 Elsevier Science B.V. All rights reserved.