NCERT Class XI Chemistry The s-Block Elements Solutions

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Question : 12
Total: 32
Discuss the various reactions that occur in the Solvay process.
Solution:  
Solvay process : It is an industrial method for obtaining sodium carbonate from sodium chloride (NaCl) and limestone (CaCO3). The raw materials required in this process are common salt, ammonia and limestone. The equations for the complete process may be written as :
2NH3+H2O+CO2(NH4)2CO3
(NH4)2CO3+H2O+CO22NH4HCO3
NH4HCO3 + NaCl → NH4Cl+NaHCO3
Sodium hydrogen carbonate crystal separates out and is heated to give sodium carbonate.
2NaHCO3
Δ
Na2CO3+CO2+H2O
CO2 required in this process is produced by heating CaCO3.
CaCO3
Δ
CaO+CO2

CaO + H2OCa(OH)2
In this process, NH3 is recovered when the solution containing NH4Cl is treated with Ca(OH)2.CaCl2 is obtained as a by product.
2NH4Cl+Ca(OH)22NH3+CaCl2+H2O
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