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C ome I Chegg.com Wilfrid Laurier Unive x www.sapling lea /ibiscms/mood/ibis/view.php?id-178907 WWW. Saplinglea ning-ca Sapling Learning ity CHEM 2 HIROBOKOV Ch12 (EDTA Ti My Assignment 11/22/2015 11:55 PM A 25/100 11/20/2015 01:37 PM Gradebook Attempts score Print Calculator Periodic Table Map EDTA is a hexaprotic system with the following pKa values: OOC-CH CH2-COO N-CH2-CH2-N pKa1 0.00 pKa4 2.69 OOC-CH CH2-COO pKa2 50 EDTA (or Y4 pKa3 2.00 pKa6 10.37 e distribution of protonated forms of EDTA will therefore vary with pH. For equilibrium calculations nvolving metal complexes with EDTA, it is convenient to calculate the fraction of EDTA that is in the completely unprotonated form, Ya (see the figure). This fraction is designated ay Calculate ay at the following two pH values: 0.95 pH 3.05 Number Previous Give Up & View Solution Check Answer Next privacy policy Jump to Resources o Assignment Information Available From: Not Set 11/22/2015 11:55 PM Due Date: Points Possible: 100 Grade Category: Graded Description: up on any question You can keep trying to answer each question until you get it right or give up lab in your question for each incorrect attempt at that OleTextbook OIHelp with This Topic orWeb Help & Videos OITechnical Support and Bug Reports ENG US 2:57 PM 2015

Explanation / Answer

alpha[Y4-] = K1K2K3K4K5K6/([H+]^6+K1[H+]5+K1K2[H+]^4+K1K2K3[H+]^3+K1K2K3K4[H+]^2+K1K2K3K4K5[H+]+K1K2K3K4K5K6

a) pH = 3/05

[H+] = 8.91 x 10^-4 M

Feed values we get,

alpha [Y4-] = 2.70 x 10^-11

b) pH = 10.95

[H+] = 1.122 x 10^-11 M

Feed values we get,

alpha[Y4-] = 0.79156

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