Washing Soda

Washing soda is used for washing of clothes. It is mainly because of this chemical that the clothes washed appear so white. Chemically, washing soda is sodium carbonate decahydrate, Na2CO3.10H2O.


Washing soda is manufacturing by Solvey's process. Sodium carbonate is obtained by calcination (strong heating in a furnace) of sodium hydrogen carbonate and then recrystallising from water:

2NaHCO3 + heat → Na2CO3 + H2O + CO2

Na2CO3 + 10H2O → Na2CO3.10H2O


  1. It is used in the manufacture of caustic soda, glass, soap powders, borex and in paper industry.

  2. For removing permanent hardness of water.

  3. As a cleansing agent for domestic purpose.