Chemistry
(a) Write a balanced chemical equation for the lab preparation of ammonia.
(b) How is ammonia dried and collected in the laboratory?
(c) Ammonia cannot be collected over water. Give reason.
Ammonia
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Answer
(a) 2NH4Cl + Ca(OH)2 ⟶ CaCl2 + 2H2O + 2NH3 [g]
(b) In order to get dry ammonia, the gas is passed through a drying tower containing lumps of quicklime [CaO]. Ammonia gas is collected in inverted gas jars by the downward displacement of air.
(c) As ammonia gas is highly soluble in water, therefore, it is not collected over water.
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