Question

Write a balanced chemical equation for each of the following:
Laboratory preparation of ammonia from ammonium chloride.

Answer 1

Laboratory Preparation of Ammonia $\left({\mathrm{NH}}_3\right)$ from Ammonium Chloride$\left({\mathrm{NH}}_4\mathrm{Cl}\right)$:

• In the laboratory, ammonia is prepared by heating a mixture of ammonium chloride and dry slaked lime (calcium hydroxide)$\left(\mathrm{CaO}\right)$.\
• In this reaction, one mole of ammonium chloride reacts with one mole of calcium hydroxide to form one mole of ${\mathrm{CaCl}}_2$ and two moles of water vapors and ammonia each.

The balanced chemical equation is:

$2{\mathrm{NH}}_4\mathrm{Cl}\left(\mathrm{aq}\right)+\mathrm{Ca}\left(\mathrm{OH}{)}_2\left(\mathrm{s}\right)\stackrel{\text{Heat}}{⟶}{\mathrm{CaCl}}_2\right(\mathrm{aq})+2{\mathrm{H}}_2\mathrm{O}(\mathrm{l})+2{\mathrm{NH}}_3(\mathrm{s})$