Tests for Gases

• Ammonia is the only basic gas

  Test: Damp red litmus paper

  Result: Turns Damp red litmus paper blue
• Carbon dioxide gas:

  Test: Bubble gas through limewater

  Result: Limewater will turn from colourless to white precipitate
• Chlorine:

  Test: Damp red or blue litmus paper

  Result: Paper will be bleached (turn white)
• Hydrogen gas:

  Test: Lighted splint

  Result: Makes a 'squeaky pop'
• Oxygen:

  Test: Glowing splint

  Result: Relights
• Sulfur Dioxide (SO2):

  Test: Acidified potassium manganate (VII)

  Result: Changes from purple to colourless