Q. 50 A3.7( 11 Votes )

Describe how washing soda is produced starting from sodium chloride(common salt). Write equations of all the reactions involved.

Answer :

Sodium carbonate is manufactured by the thermal decomposition of sodium hydrogen carbonate.

NaCl + CO2 + NH3 + H2O NH4Cl + NaHCO3


The sodium carbonate obtained in this process is dry. It is called soda ash or anhydrous sodium carbonate. Washing soda is obtained by rehydration of anhydrous sodium carbonate.


Na2CO3 + 10H2O Na2CO3.10H2O


Since there are 10 water molecules in washing soda, hence it is known as Sodium bicarbonate decahydrate.


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