2000•Canadian Journal of ChemistryRequires access

Determination of the acidity constant of isothiocyanic acid in aqueous solution

Y. Chiang, A. J. Kresge

Abstract

Changes in absorbance of the thiocyanate ion (SCN) at λ = 220 nm, measured in concentrated aqueous perchloric acid solution, were analyzed using a titration curve expression containing the Xo excess acidity function; this provided the acidity constant Ka = 19.2 ± 1.1 M, pKa = 1.28 ± 0.03, for isothiocyanic acid (SCNH).Key words: isothiocyanic acid (acidity of), thiocyanate ion (basicity of), acidbase titration in concentrated aqueous acids, Xo excess acidity function, CoxYates method.

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Key concepts: Chemistry, Acidity function, Titration, Perchloric acid, Aqueous solution, Titration curve, Thiocyanate, Acid dissociation constant