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A simple spectrophotometric determination of dissociation constants of organic compounds

โœ Scribed by Yeong-Jae Seok; Kap-Seok Yang; Sa-Ouk Kang

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
525 KB
Volume
306
Category
Article
ISSN
0003-2670

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โœฆ Synopsis

A simple and rapid method is introduced for the determination of dissociation constants of organic compounds by means of UV-visible spectrophotometry. It is applicable to the compounds whose concentrations or extinction coefficients are not determined. It provides more exact dissociation constants than other methods, even for polyprotic compounds with almost equal pK, values and compounds with extremely acidic or extremely basic properties.

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## AhStlWt The dissociation constant of meta-arsenous acid (HAsO,) was accurately determined from spectrophotometric measurements, combined with volumetric methods. The measurement of pH of the analyte solution containing HAsO,, which was titrated with sodium hydroxide, was achieved by the spectro