Why is lime tower used to collect ammonia gas?
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Answer:
The test for carbon dioxide is that it returns calcium hydroxide milky or cloudy. Ammonia also reacts with calcium chloride. Ammonia is very soluble in water and is also lighter than air. So, notice that it is collected by the method of upward delivery.
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Lime tower is used to collect ammonia gas because both lime as well as ammonia are basic in nature and hence do not react with each other.
- Ammonia is a basic gas.
- Acidic dehydrating agents like Conc. sulfuric acid and penta phosphorous oxide cannot be used to collect ammonia gas since ammonia reacts with these agents to give a salt.
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