metal hydroxides

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    sim

    Cards (8)

    • sodium hydroxide solutions can be used to identify some metal ions (cations)
    • test for ALUMINIUM/CALCIUM/MAGNESIUM
      add sodium hydroxide
      • white precipitate
      if excess added, the aluminium precipitate dissolves
      calcium = flame test = orange/red flame
    • test for calcium equation:
      calcium nitrate + sodium hydroxide --> sodium nitrate + calcium hydroxide
      Ca(NO3) + 2NaOH --> 2NaNO3 + Ca(OH)2
    • test for magnesium equation:
      magnesium nitrate + sodium hydroxide --> sodium nitrate + magnesium hydroxide
      Mg(NO3)2 + 2NAOH --> 2NaNO3 + Mg(OH)2
    • test for aluminium equations;
      aluminium nitrate + sodium hydroxide --> sodium nitrate + aluminium hydroxide
      Al(NO3)3 + 3NaOH --> 3NaNO3 + Al(OH)3
    • copper(II) react with sodium hydroxide to form a BLUE precipitate
      equation: copper nitrate + sodium hydroxide --> sodium nitrate + copper hydroxide
    • iron(II) reacts with sodium hydroxide to form a GREEN precipitate
    • iron(III) react with sodium hydroxide to form a BROWN precipitate