testing for gases

• What is the test for hydrogen gas?

  • Remove the bung from the test tube
  • Insert a burning splint
  • A pop sound indicates the presence of hydrogen
• What is the test for oxygen gas?

  • Use a glowing splint
  • Place the glowing splint into the test tube
  • The splint reignites, indicating the presence of oxygen
• How do you test for carbon dioxide?

  • Use lime water (aqueous solution of calcium hydroxide)
  • Bubble the gas through the lime water
  • If the lime water turns cloudy, carbon dioxide is present
• What indicates the presence of carbon dioxide when using lime water?

  If the lime water turns cloudy
• What is lime water?

  An aqueous solution of calcium hydroxide
• What is the test for chlorine gas?

  • Insert damp litmus paper into the test tube
  • Chlorine bleaches the litmus paper
  • The litmus paper turns white, indicating chlorine's presence
• What happens to litmus paper when exposed to chlorine gas?

  It bleaches and turns white