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Why is ammoni...

Question

Why is ammonia not collected over water?

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Solution

Ammonia is highly soluble in water. To prevent the loss of ammonia by dissolution in water, it is not collected over water.

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Q. Assertion :Ammonia gas collected over water by the downward displacement of air. Reason: Ammonia is not collected over water since it is highly soluble in water.

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

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?

Q. Ammonia cannot be collected over water. Give reasons.

Q. Assertion :The downward displacement of air method used for drying and collecting ammonia gas. Reason: Ammonia gas is lighter than air and hence collected by the downward displacement of air. Ammonia is not collected over water since it is highly soluble in water.(1 vol.of water dissolves about 702 vol.at 20C and 1 atm pressure). The drying agent used is calcium oxide.

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