A hiperbolic sine procedure for the spectrophotometric evaluation of acidity constants for two-step overlapping equilibria
DOI: 10.1134/S1061934809100098
关键词: Analytical chemistry 、 Absorbance 、 Hyperpolarizability 、 Diprotic acid 、 Benzidine 、 Linearization 、 Zwitterion 、 Acid dissociation constant 、 Chemical shift 、 Chemistry
摘要: An equation relating the absorbance of solute to acidity constants (pKa1 and pKa2) pH is derived for weak diprotic acids (diprotic bases zwitterions). The applicable in those cases which limiting species HR intermediate between that R H2R. evaluation two-step overlapping equilibria from spectrophotometric measurements may be carried out this way by linear plotting. task solving via a hyperbolic sine linearization versus graph. procedure has been tested with benzidine system found give good results. could also applied other additive properties such as chromatographic retention factors, electrophoretic mobilities, NMR chemical shifts, fluorescence measurements, or hyperpolarizability.
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