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Question

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
 


Solution

Answer: (a) CaCl2 

Sodium carbonate is synthesised by Solvay ammonia soda process.
The reactions involved are
NH3+H2O+CO2NH4HCO3Ammonium bicarbonateNaCl+NH4HCO3NaHCO3SOdium bicarbonatre+NH4Cl2NaHCO3Na2CO3Sodium carbonate+H2O+CO2
   NH3 is recovered from NH4HCO3 and NH4 Cl formed during the reaction.
NH4HCO3Heat−−NH3+H2O+CO22NH4ClAmmonium chloride+Ca(OH)22NH3Ammonia+CaCl2Celcium chloride+2H2O


Chemistry
NCERT Exemplar
Standard XI

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