To obtain ammonia, the method of moderate heating of a mixture of ammonium chloride with slaked lime is widely used.
2NН4Cl + Ca (OH) 2 = CaCl2 + 2NH3 + 2H2О.
To further dry the ammonia, it is passed through a mixture of lime and sodium hydroxide.
Another laboratory method is the action of strong alkalis on ammonium salts:
NH4Cl + NaOH = NH3 + NaCl + H2O.
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