- Ammonia extinguishes a lighted taper because it dos not support burning.
- It is non-combustible.
- However it burns in air enriched with oxygen with a green-yellow flame.
Procedure:
- Dry oxygen is passed in the U-tube for a while to drive out air.
- Dry ammonia gas is then passed into the tube.
- A lighted splint is then passed into the tube.
Observations:
- A colourless gas is liberated.
- Droplets of a colourless liquid collect on cooler parts of the tube.
Explanations:
- The conditions for the reactions are:
Dry ammonia and oxygen gas i.e. the gases must be dry.
All air must be driven out of the tube.
- Ammonia burns continuously in oxygen (air enriched with oxygen) forming nitrogen and water vapour i.e. ammonia is oxidized as hydrogen is removed from it leaving nitrogen.
Kavungya answered the question on April 30, 2019 at 10:31
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