The distribution of protonated forms of EDTA will therefore vary with pH. For eq

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The distribution of 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, Y4. This fraction is designated ?Y4. Calculate ?Y4 at the following two pH values: 3.60 and 10.75

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EDTA is a hexaprotic system with the following pKa values: PK1 = 0 PK2 = 1.50 PK3 = 2.00 PK4 = 2.69 PK5 = 6.13 PK6 = 10.37 The distribution of 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, Y4 (see the figure) This fraction is designated alpha gamma ^4-. Calculate alpha gamma ^4- at the following two pH values:

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