EDTA is a hexaprotic system with the pKa values: -ooC-CH2 H,C-COO pKal 0.00, pK2 = 1.50, pKa3 = 2.00, pKa4 = 2.69, :N-CH2-CH2-N: pKa5 = 6.13, and pKa6 OOC-CH2 H2C-COO The distribution of the various protonated forms of EDTA EDTA (or Y4) will therefore vary with pH. For equilibrium calculations involving metal complexes with EDTA, it is convenient to calculate the fraction of EDTA that is in the completely unprotonated form, Y. This fraction is designated ays-. Calculate ayi- at two pH values. 4.41 pH = 3.60 %3D Incorrect 8.25 pH = 10.80 dy4- =

EDTA is a hexaprotic system with the pKa values: -ooC-CH2 H,C-COO pKal 0.00, pK2 = 1.50, pKa3 = 2.00, pKa4 = 2.69, :N-CH2-CH2-N: pKa5 = 6.13, and pKa6 OOC-CH2 H2C-COO The distribution of the various protonated forms of EDTA EDTA (or Y4) will therefore vary with pH. For equilibrium calculations involving metal complexes with EDTA, it is convenient to calculate the fraction of EDTA that is in the completely unprotonated form, Y. This fraction is designated ays-. Calculate ayi- at two pH values. 4.41 pH = 3.60 %3D Incorrect 8.25 pH = 10.80 dy4- =

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter13: An Introduction To Ultraviolet-visible Molecular Absorption Spectrometry

Section: Chapter Questions

Problem 13.21QAP

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