Transition metal help please Watch

anactualmess
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When dissolved in dilute sulfuric acid, the number of moles of ethanedioate ions in a pigment can be determined by titration with acidified potassium manganate(VII).
Explain why the titration of a sample of iron(II) ethanedioate would require a different amount of potassium manganate(VII) than a titration of an equimolar amount of copper(II) ethanedioate.
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Pigster
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(Original post by anactualmess)
When dissolved in dilute sulfuric acid, the number of moles of ethanedioate ions in a pigment can be determined by titration with acidified potassium manganate(VII).
Explain why the titration of a sample of iron(II) ethanedioate would require a different amount of potassium manganate(VII) than a titration of an equimolar amount of copper(II) ethanedioate.
Why do you think it might be?

What is different about the two solutions?
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anactualmess
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different oxidation states?
(Original post by Pigster)
Why do you think it might be?

What is different about the two solutions?
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anactualmess
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I am still very confused lol
(Original post by Pigster)
Why do you think it might be?

What is different about the two solutions?
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charco
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(Original post by anactualmess)
I am still very confused lol
Both iron and ethandioate ions react with the oxidising agent
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anactualmess
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sorry I still don't really understand
(Original post by charco)
Both iron and ethandioate ions react with the oxidising agent
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Dilof
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(Original post by anactualmess)
sorry I still don't really understand
Fe2+ and C2O4 2- both react with the MnO4- ions whereas the copper ions do not, thats the difference.

5Fe2+ + MnO4- + 8H+ > 5Fe3+ + Mn2+ + 4H2O
5C2O4(2-) + 2MnO4- + 16H+ > 8H2O + 2Mn2+ + 10CO2
Last edited by Dilof; 4 weeks ago
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anactualmess
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thank you! So would a greater volume of potassium manganate be needed for iron ethanedioate?
(Original post by Dilof)
Fe2+ and C2O4 2- both react with the MnO4- ions whereas the copper ions do not, thats the difference.
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Dilof
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(Original post by anactualmess)
thank you! So would a greater volume of potassium manganate be needed for iron ethanedioate?
Yes
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anactualmess
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thanks, one more question, how would I know that copper ions don't react with MnO4- ions?
(Original post by Dilof)
Yes
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charco
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(Original post by anactualmess)
thanks, one more question, how would I know that copper ions don't react with MnO4- ions?
copper has no higher oxidation state than 2+
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anactualmess
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(Original post by charco)
copper has no higher oxidation state than 2+
ah okay thank you
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