Tests for gases
Hydrogen, oxygen and carbon dioxide can be identified using different tests.
Hydrogen
Putting the flame of a lighted wooden splint in a test tube of hydrogen makes a âsqueaky popâ sound.
Oxygen
Putting a glowing wooden splint in a test tube of oxygen, causing the splint to relight.
Carbon dioxide
Bubbling carbon dioxide through Calcium hydroxide solution. It turns milky in the presence of carbon dioxide. changes it from colourless to âmilkyâ due to the formation of a white precipitate of calcium carbonate.