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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