One of the by-products formed during the recovery of NH₃ from Solvay process is :

Solution

Chemistry ma’am · 3 steps

Ammonia is recovered by heating NH₄Cl with lime, and the calcium is left behind as CaCl₂.

1. Main reaction. Brine is saturated with NH₃ and CO₂ is passed through it. NaHCO₃ precipitates because it is only sparingly soluble, and NH₄Cl stays in solution: NaCl + NH₃ + CO₂ + H₂O → NaHCO₃ + NH₄Cl.
2. Recovering ammonia. NH₃ is too costly to throw away, so the NH₄Cl solution is heated with slaked lime. The lime comes from heating limestone, CaCO₃ → CaO + CO₂, followed by CaO + H₂O → Ca(OH)₂.

   2NH₄Cl + Ca(OH)₂ → 2NH₃ ↑ + CaCl₂ + 2H₂O

3. So. NH₃ goes back into the process, and CaCl₂ is the by-product of this step. The answer is (d).

The idea to keep. In the Solvay process, CO₂ and NH₃ are both recycled. The only real waste is CaCl₂, formed when NH₄Cl is treated with Ca(OH)₂.

Answer from the NTA final answer key. Solution by PrepWiser.