A. Look up and report Kf for copper(II), iron(II), and iron(III) with EDTA. Cite your reference(s)....

A. Look up and report K_f for copper(II), iron(II), and iron(III) with EDTA. Cite your reference(s). (0.2) (I DID THIS ALREADY)

B. What happens to your titration and results if any of those metals are present? Write a balanced chemical equation showing the impact of iron(III) present in the tap water when you are analyzing for calcium. (0.4)

C. What is done to keep iron ions from interfering? Write a balanced chemical equation for this reaction. (0.4)

D. What is done to keep copper ions from interfering? Write a balanced chemical equation for this reaction. (0.4)

Please help!!!! I really want to understand this

Expert Solution

1)

Cu²⁺ = 6.3 x 10¹⁸

Both the hexa–aqua ions of iron(II) and iron(III) readily complex with EDTA

[Fe(H₂O)₆]²⁺_(aq) + EDTA^4–_(aq) ===> [Fe(EDTA)]^2–_(aq) + 6H₂O_(l)

K_stab = {[Fe(EDTA)₃]^2–_(aq)} / {[Fe(H₂O)₆]²⁺_(aq)} [EDTA^4–_(aq)]

K_stab = 2.0 x 10¹³ mol^–1 dm³and lg(K_stab) = 14.3

[Fe(H₂O)₆]³⁺_(aq) + EDTA^4–_(aq) ===> [Fe(EDTA)]^–_(aq) + 6H₂O_(l)

K_stab = {[Fe(EDTA)₃]^–_(aq)} / {[Fe(H₂O)₆]³⁺_(aq)} [EDTA^4–_(aq)]

K_stab = 1.3 x 10²⁵ mol^–1 dm³and lg(K_stab) = 25.1

Note that the more highly charged Fe³⁺_(aq) ion complexes more strongly than the Fe²⁺_(aq) ion.

2) iron 3 will interfere

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