Tests for negative ions

• Carbonate Test Practical:

  1. 1 pipette of a Carbonate in one test tube
  2. 2 cm^3 of limewater into a boiling tube
  3. Add 1 pipette of dilute Hydrochloric Acid to the Carbonate and it will fizz
  4. Place bung on top of it and connect to limewater
  5. Shake till limewater turns cloudy
• Sulfate Test Practical:

  1. 1 cm^3 of a Sulfate in one test tube
  2. Add a few drops of Hydrochloric Acid
  3. Add 1 cm^3 of Barium Chloride
  4. Wait till white precipitate appears
• Halide Test Practical:

  1. 1 cm^3 of Halide into a test tube
  2. Add a few drops of nitric acid
  3. Add 1cm^3 of silver nitrate
  4. Will form either a white/creamy/yellow precipitate
• What 3 halides do we need to know?

  Chloride, Bromide and Iodide
• In a halide test what halide ion turns precipitate white?

  Chloride
• In a halide test what halide ion turns precipitate creamy?

  Bromide
• In a halide test what halide ion turns precipitate yellow?

  Iodide