"ooc-CH, H,C-coo EDTA is a hexaprotic system with the pK, values: pKa1 = 0.00, pK2 = 1.50, pK3 = 2.00, pK„4 = 2.69, pKas = 6.13, and pK = 10.37. N-CH,-CH,-N: "ooc-CH, Hc-coo EDTA (or Y) The distribution of the various protonated forms of EDTA 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 ay- . Calculate ayu. at two pH values. pH = 3.85 aya = pH = 10.70 aya =

"ooc-CH, H,C-coo EDTA is a hexaprotic system with the pK, values: pKa1 = 0.00, pK2 = 1.50, pK3 = 2.00, pK„4 = 2.69, pKas = 6.13, and pK = 10.37. N-CH,-CH,-N: "ooc-CH, Hc-coo EDTA (or Y) The distribution of the various protonated forms of EDTA 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 ay- . Calculate ayu. at two pH values. pH = 3.85 aya = pH = 10.70 aya =

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

Chapter9: Atomic Absorption And Atomic Fluorescence Spectrometry

Section: Chapter Questions

Problem 9.6QAP

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EDTA is a hexaprotic system with the pK, values: "ooc-CH2 H,C-coo pKal = 0.00, pK2 = 1.50, pK = 2.00, pK4 = 2.69, :N-CH-CH-N: pKas = 6.13, and pK6 = 10.37. %3D "ooc-CH2 HC-coo The distribution of the various protonated forms of EDTA EDTA“ (or Y-) will therefore vary with pH. For cquilibrium 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 aya. Calculate ay at two pH values. 6.33 X10-13 pH = 3.15 ay = Incorrect 0.1327 pH = 10.55 dy = %3D Incorrect
EDTA is a hexaprotic system with the pKa values: FOOC-CH2 H2C-CoO pKal = 0.00, pK22 = 1.50, pK23 = 2.00, pK4 = 2.69, 2.00, рКа4 :N-CH2-CH2-N: %3D %D pK25 = 6.13, and pKa6 = 10.37. %3D 0OC-CH2 H,C-co The distribution of the various protonated forms of EDTA EDTA4- (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 ay4- . Calculate ay4- at two pH values. pH = 3.85 %3D dy4- = pH = 10.80 %3D dy4- =
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