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 (C a C O 3 ). The raw materials required in this process are common salt, ammonia and limestone. The equations for the complete process may be written as :
2 N H 3 + H 2 O + C O 2 → ( N H 4 ) 2 C O 3
( N H 4 ) 2 C O 3 + H 2 O + C O 2 → 2 N H 4 H C O 3
N H 4 H C O 3 + NaCl → N H 4 C l + N a H C O 3
Sodium hydrogen carbonate crystal separates out and is heated to give sodium carbonate.
2 N a H C O 3
N a 2 C O 3 + C O 2 + H 2 O
C O 2 required in this process is produced by heating C a C O 3 .
C a C O 3
C a O + C O 2
CaO +H 2 O → C a ( O H ) 2
In this process,N H 3 is recovered when the solution containing N H 4 C l is treated with C a ( O H ) 2. C a C l 2 is obtained as a by product.
2 N H 4 C l + C a ( O H ) 2 → 2 N H 3 + C a C l 2 + H 2 O
Sodium hydrogen carbonate crystal separates out and is heated to give sodium carbonate.
CaO +
In this process,
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