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

  • Green solution-->green ppt-->green ppt-->green solution
  • Green solution-->green ppt-->green ppt-->green ppt
  • Yellow solution-->brown ppt-->brown ppt-->brown ppt
  • Yellow solution-->brown ppt-->brown ppt-->brown solution

3. solutions with excess OH-

  • Cr3+,Ni2+
  • Cr3+,Fe2+
  • Cr3+, ZN2+
  • Cr3+,Mn2+

4. Fe(H2O)4(OH)2

  • White precipitate
  • Brown precipitate
  • Green precipitate
  • Blue precipitate

5. [Zn(H2O)(OH)]2+ +excess NH3

  • green solution
  • colourless solution
  • purple solution
  • brown solution
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