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  3. a. look up and report kf for copper(ii), iron(ii),

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

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Chemistry

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

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

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

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

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

Answer & Explanation Solved by verified expert
4.2 Ratings (799 Votes)

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) + EDTA4–(aq) ===> [Fe(EDTA)]2–(aq) + 6H2O(l)

                          Kstab = {[Fe(EDTA)3]2–(aq)} / {[Fe(H2O)6]2+(aq)} [EDTA4–(aq)]

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

  • [Fe(H2O)6]3+(aq) + EDTA4–(aq) ===> [Fe(EDTA)]–(aq) + 6H2O(l)

                        Kstab = {[Fe(EDTA)3]–(aq)} / {[Fe(H2O)6]3+(aq)} [EDTA4–(aq)]

                        Kstab = 1.3 x 1025 mol–1 dm3and lg(Kstab) = 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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