The formation constant for FeY^- is 1.3 x 10²⁵. Calculate the concentration of free Fe³⁺ in a FeY^- 0.10 M solution at pH 4.00 and pH 1.00 and explain at what pH it is more convenient to carry out a titration with EDTA for Fe³⁺, sketch the form that the titration curves for this complex would have at the two pH's: answer: a) pH 4.00 [Fe³⁺] = 1.4 x 10^-9 M and at pH 1.00, Fe³⁺] = 6.4 x 10^-5 M.

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