Precipitation Reactions

Precipitation reactions of tranisition metals required for OCR Chemistry A (A2)

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  • Created by: Ella
  • Created on: 18-05-15 11:33
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2+ -
Cu (aq) + 2OH (aq) Cu(OH)2(s)
Clear blue solution Bright blue precipitate
[Cu(H2O)6]2+ + 2OH- [Cu(H2O)4(OH)2] + 2H2O
2+ -
Co (aq) + 2OH (aq) Co(OH)2(s)
(Pink on
Clear pink solution Dark blue precipitate standing)
[Co(H2O)6]2+ + 2OH- [Co(H2O)4(OH)2] + 2H2O
2+ -
Fe (aq) + 2OH (aq) Fe(OH)2(s)
(Darkens, goes
Clear pale green solution Green precipitate orange on top
on standing)
[Fe(H2O)6]2+ + 2OH- [Fe(H2O)4(OH)2] + 2H2O
3+ -
Fe (aq) + 3OH (aq) Fe(OH)3(s)
(Darkens on
Clear yellow solution Orange precipitate standing)
[Fe(H2O)6]3+ + 3OH- [Fe(H2O)3(OH)3] + 3H2O


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