QQuestion
The following questions are pertaining to the laboratory preparation of Ammonia gas from Magnesium nitride:
(a) Write a balanced chemical equation for its preparation.
(b) Why is this method seldom used?
(c) How do you identify the gas formed?
✓Answer
(a) Mg3N2 + 6H2O → 3Mg(OH)2 + 2NH3
(b) Magnesium nitride is expensive, so this method is seldom used.
(c) Ammonia turns moist red litmus paper blue. It also forms dense white fumes of ammonium chloride when a glass rod dipped in concentrated hydrochloric acid is brought near the gas.
NH3 + HCl → NH4Cl
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