Solution:concept - Sodium carbonate is produced mainly by the Solvay process. The other names for sodium carbonate are soda crystals, washing soda, and soda ash.
In this process, carbon dioxide and ammonia are converted into a cold-saturated sodium chloride solution. During ongoing reactions, sodium bicarbonate is formed, which is only slightly soluble in the presence of sodium ions, and is almost completely precipitated. It is removed by filtration and ignited to form sodium carbonate.
The components of this process are readily available and inexpensive. These are salt solution ( ), ammonia ( ) and limestone ( ).
Ammonia bicarbonate reacts with a brine solution of and forms sodium bicarbonate or sodium hydrogen carbonate.
So, in the Solvay ammonia process, sodium bicarbonate is precipitated due to a reaction with brine solution.
Hence, the correct option is (3).