Testing for gases

• How do you test for hydrogen gas?

  Remove the bung and insert a burning splint, hydrogen gas burns rapidly and will produce a pop sound.
• How do you test for oxygen gas?

  Use a glowing splint, if we place the splint into a test tube of oxygen the splint will relight.
• How do you test for carbon dioxide gas?

  Use limewater, limewater is an aqueous solution of calcium hydroxide, draw some of the gas into a plastic pipette and bubble the gas through the limewater. If the limewater turns cloudy, this means carbon dioxide is present.
• How do you test for chlorine gas?

  Insert damp litmus paper into the mouth of the test tube, if chlorine is present it will bleach the litmus paper and will turn it white.