Q. 5

Write the chemica

Answer :

• Chemical name of Na2CO3.10H2O: Sodium Carbonate Decahydrate (Washing soda)

• Na2CO3 : Sodium Carbonate (Soda ash)


• 10H2O is the water of crystallization of sedum carbonate. Water of crystallization is the fixed number of water molecules present in one formula unit of a salt. Thus ‘10’ water molecules are present in one formula unit of sodium carbonate.


Washing soda is produced by Solvay process, by the reaction of ammonical brine with CO2 gas.


NaCl + NH3 + CO2 + H2O NaHCO3 + NH4Cl


NaHCO3 on heating produces Na2CO3 (Sodium carbonate, called soda ash) which on recrystallization produces washing soda.




Washing soda is a basic salt.


Some important uses of washing soda:


(i) Washing soda is used in the glass, soap and paper industries.


(ii) It is used in the manufacture of borax compound.


(iii) It is used as a cleansing agent for domestic purposes.


(iv) It is used for removing permanent hardness of water.


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