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Reaction with Metals

The following...

Question

The following questions are based on the preparation of ammonia gas in the laboratory:
How is ammonia gas collected?

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Solution

Ammonia is lighter than air hence it displaces air downward. It is highly soluble in water and hence cannot be collected over water.

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Q. The following questions are based on the preparation of ammonia gas in the laboratory:
Explain why it is not collected over water?

Q. The following questions are based on the preparation of ammonia gas in the laboratory:
Explain why ammonium nitrate is not used in the preparation of ammonia?

Q. (i) How is ammonia gas prepared in laboratory starting from NH₄Cl? State the conditions and balanced equation for the preparation.
(ii) How is gas collected in a gas jar?
(iii) Name the substance used for drying ammonia gas. Why cannot substances such as conc. H₂SO₄, anhydrous calcium chloride and phosphorus pentoxide be used for drying ammonia gas?

Q. The following questions are based on the preparation of ammonia gas in the laboratory:
Name the compound normally used as a drying agent during the process.

Q. (i) Write the balanced chemical equation to prepare ammonia gas in the laboratory by using an alkali.
(ii) State why concentrated sulphuric acid is not used for drying ammonia gas.
(iii) Why is ammonia gas not collected over water?

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