Precipitation of Metal Ions

• What do solutions of metal compounds contain?

  Metal ions
• Some solutions of metal compounds form precipitates. What are precipitates?

  Insoluble solids that come out of solution when sodium hydroxide solution is added to them
• How can some metal ions be identified with a sodium hydroxide solution ?

  By adding a sodium hydroxide to solutions of metal ions , precipitates of that metal ion will form
• What precipitate is formed when sodium hydroxide solution is mixed with Aluminium, and what colour will it be?

  Aluminium hydroxide - It colour is white, however if more sodium hydroxide gets added, it will dissolve
• What precipitate is formed when sodium hydroxide solution is mixed with Calcium, and what colour will it be?

  Calcium hydroxide - Its colour is white
• What precipitate is formed when sodium hydroxide solution is mixed with Magnesium, and what colour will it be?

  Magnesium hydroxide - Its colour is white
• What precipitate is formed when sodium hydroxide solution is mixed with Copper II , and what colour will it be?

  Copper II hydroxide - Its colour is blue
• What precipitate is formed when sodium hydroxide solution is mixed with Iron II , and what colour will it be?

  Iron II hydroxide - Its colour is green
• What precipitate is formed when sodium hydroxide solution is mixed with Iron III , and what colour will it be?

  Iron III hydroxide - its colour is brown