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EDTA is a hexaprotic system with the following pKa values: pKa1 = 0.00 pKa4 = 2.69...

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Chemistry

EDTA is a hexaprotic system with the following pKa values: pKa1= 0.00 pKa4 = 2.69 pKa2 = 1.50 pKa5 = 6.13 pKa3 = 2.00 pKa6 = 10.37The distribution of protonated forms of EDTA will therefore varywith pH. For equilibrium calculations involving metal complexeswith EDTA, it is convenient to calculate the fraction of EDTA thatis in the completely unprotonated form, Y4– . This fraction isdesignated αY4–. Calculate αY4– at the following two pH values:

pH=3.45

pH=10.85

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4.1 Ratings (872 Votes)
alphaY4 K1K2K3K4K5K6H6K1H5K1K2H4K1K2K3H3K1K2K3K4H2K1K2K3K4K5HK1K2K3K4K5K6 a pH 345 H 355 x 104 M    See Answer
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