Transition Metals in Aqueous Solution part 1

Part 1 of 3 of the reactions of transition metals in ions, covering sodium hydroxide in small amounts and in excess. Start at the top and work down!

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  • [M(H2O)6]2+
    • Fe: pale green
    • Co: pink
    • Cu: pale blue
  • [M(H2O)6]3+
    • Small amount of NaOH
      • [M(H2O)6]2+
        • Fe: pale green
        • Co: pink
        • Cu: pale blue
      • M(H2O)3(OH)3
        • Fe: brown precipitate
        • Al: white precipitate
        • Cr: green precipitate
      • M(H2O)4(OH)2
        • Fe: green
        • Co: blue
        • Cu: pale blue
      • NaOH to excess
        • No change from small amount
        • Fe: no change from small amount
        • [Al(OH)4]- (colourless solution)
        • [Cr(OH)6]3- (green solution)
    • Al: colourless
    • Cr: ruby
    • Fe: purple/yellow/brown
  • Small amount of NaOH
    • M(H2O)3(OH)3
      • Fe: brown precipitate
      • Al: white precipitate
      • Cr: green precipitate
    • M(H2O)4(OH)2
      • Fe: green
      • Co: blue
      • Cu: pale blue
    • NaOH to excess
      • No change from small amount
      • Fe: no change from small amount
      • [Al(OH)4]- (colourless solution)
      • [Cr(OH)6]3- (green solution)

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