testing for Gases

• What is the first step to test for hydrogen gas?

  Remove the bung and insert a burning splint
• What sound indicates the presence of hydrogen gas?

  A pop sound when it burns rapidly
• What type of splint is used to test for oxygen gas?

  A glowing splint
• What happens to a glowing splint in oxygen gas?

  It bursts into flames
• What is used to test for carbon dioxide gas?

  Lime water
• What indicates that carbon dioxide is present when using lime water?

  The lime water turns cloudy
• What is lime water a solution of?

  Aqueous calcium hydroxide
• How do you introduce the gas into lime water for testing?

  Bubble the gas through the lime water
• What is the final gas tested for in the video?

  Chlorine
• How is chlorine gas tested?

  By inserting damp litmus paper into the test tube
• What effect does chlorine have on litmus paper?

  It bleaches the paper and turns it white