Testing for Gases.

Question 1

How do we test for Hydrogen?

Answer 1

• Remove the bung of a test tube and insert a burning splint.
• Hydrogen gas burns rapidly and produces a pop sound.

Question 2

How do we test for oxygen?

Answer 2

• Use a glowing splint.

- If we place the glowing tube into the test tube of oxygen the splint relights.

Question 3

How do we test for co2?

Answer 3

• We use limewater.
• Limewater is an aqeuous solution of calcium hydroxide.
• Draw some of the gas into a plastic pippete.
• Bubble the gas through the limewater.
• Repeated several times limewater turns cloudy.

Question 4

How do we test for chlorine?

Answer 4

• Insert damp litmus paper into the mouth of test tube.

- Chlorine bleaches it and makes it turn white.