Chemistry C3 Identifying positive ions

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  • Unknown Positive Compounds
    • Unknown solution-add sodium hydroxide
      • White precipiate (Al,Mg,Ca,Pb)
        • Dissolves in excess sodium hydroxide solution (Al,Pb)
        • Insoluble in excess sodium hydroxide solution (Mg,Ca)
          • Distinguish by flame test
      • Coloured precipitate (Cu,Fe2+,Fe3+,K)
        • Reddish brown precipitate Fe3+
        • Light blue precipitate Cu
        • Yellow  precipitate K
        • Light green precipitate which slowly turns brown Fe2+


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