2nd October 2019

bbc
10

How do you test for gas?

You need to know how to test for hydrogen, oxygen, carbon dioxide, ammonia and chlorine.
  1. Hydrogen. A lighted wooden splint makes a popping sound in a test tube of hydrogen.
  2. Oxygen. A glowing wooden splint relights in a test tube of oxygen.
  3. Carbon dioxide.
  4. Ammonia.
  5. Chlorine.

Regarding this, why does carbon dioxide cause the splint to go out?

Carbon dioxide molecules are heavier than air. Because of this, they push the oxygen and other molecules in the air out of the way as they sink down over the flame and candle. When oxygen is pushed away from the wick, it can't react with the wax anymore. This makes the flame go out.

How do you test for the presence of hydrogen gas?

To test for hydrogen gas evolved, insert a lighted splint into the test tube. The lighted splint should extinguish with a characteristic "pop" sound. Note that if there is insufficient hydrogen gas, the flame may not be completely extinguished.
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