Determination of the acidity constant of isothiocyanic acid in aqueous solution

Authors
Chiang, Y Kresge, AJ
Citation
Y. Chiang et Aj. Kresge, Determination of the acidity constant of isothiocyanic acid in aqueous solution, CAN J CHEM, 78(12), 2000, pp. 1627-1628
Citations number
8
Categorie Soggetti
Chemistry
Journal title
CANADIAN JOURNAL OF CHEMISTRY-REVUE CANADIENNE DE CHIMIE
ISSN journal
00084042 → ACNP
Volume
78
Issue
12
Year of publication
2000
Pages
1627 - 1628
Database
ISI
SICI code
0008-4042(200012)78:12<1627:DOTACO>2.0.ZU;2-E
Abstract
Changes in absorbance of the thiocyanate ion (SCN-) at lambda = 220 nm, mea sured in concentrated aqueous perchloric acid solution, were analyzed using a titration curve expression containing the X-o excess acidity function; t his provided the acidity constant K-a = 19.2 +/- 1.1 M, pK(a) = -1.28 +/- 0 .03, for isothiocyanic acid (SCNH).