Transition Metal colours

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1. Fe3+(metal aqua ion, then adding OH- or NH3, excess OH-, excess NH3)

  • Yellow solution-->brown ppt-->brown ppt-->brown ppt
  • Green solution-->green ppt-->green ppt-->green ppt
  • Yellow solution-->brown ppt-->brown ppt-->brown solution
  • Green solution-->green ppt-->green ppt-->green solution
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2. Cr(metal aqua ion, then adding OH- or NH3, excess OH-, excess NH3)

  • Violet/Green-->green ppt-->green solution-->purple solution
  • Violet/Green-->green ppt-->green ppt-->purple solution
  • Violet/Green-->green ppt-->green ppt-->green solution
  • Violet/Green-->green ppt-->green solution-->green solution

3. [Mn(H2O)6]2+ +excess NH3

  • Brown precipitate
  • green solution
  • Brown solution
  • Purple solution

4. [Fe(H2O)6]2+

  • Green solution
  • Brown solution
  • Blue solution
  • Yellow solution

5. [Ni(H2O)6]2+ +excess OH-

  • Purple solution
  • Blue solution
  • Green precipitate
  • Green solution

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