Q. 115.0( 1 Vote )

In the synthesis of sodium carbonate, the recovery of ammonia is done by treating NH4Cl with Ca(OH)2. The by-product obtained in this process is
A. CaCl2

B. NaCl

C. NaOH

D. NaHCO3

Answer :

Sodium carbonate is prepared from sodium by Solvay process. The equations in the process involved are as follows:

2NH3 + H2O + CO2 (NH4)2CO3


(NH4)2CO3 + H2O + CO2 2NH4HCO3


NH4CO3 + NaCl NH4Cl + NaHCO3


2NaHCO3 Na2CO3 + CO2 + H2O


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


Carbon dioxide is passed through a concentrated solution of sodium chloride saturated with ammonia, which forms ammonium carbonate followed by ammonium hydrogen carbonate. Ammonium hydrogen carbonate crystals separate and they are heated to form sodium carbonate. NH3 is recovered from the solution which contains NH4Cl is heated and treated with Ca(OH)2. Calcium chloride is obtained as a by-product. The correct answer is (i).

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