Acid Base & Salt - Class 10th Science

Washing Soda (Sodium Carbonate)

Washing soda is another important chemical obtained from sodium chloride (common salt). The chemical name of washing soda is sodium carbonate (Na2CO3). Washing soda is the sodium salt of carbonic acid. As its name says, washing soda is used in washing.

Production of washing soda:

By Solvay Process:

In Solvay process first sodium bicarbonate is produced. This sodium bicarbonate on heating gives sodium carbonate (washing soda).

solvay process-production of sodium bicarbonate 109 solvay process-production of sodium bicarbonate 110 solvay process-production of sodium bicarbonate 111

thermal decomposition of sodium bicarbonate 112 thermal decomposition of sodium bicarbonate 113

Sodium carbonate obtained in this Solvay process is dry, so it is also called soda ash.

The Solvay process got its name after Ernest Solvay who developed this process in 1861. Earnest Solvay was an industrial chemist and belonged to Belgian.

Soda ash (anhydrous soda) to washing powder:

By treating with water anhydrous sodium carbonate (soda ash) is converted into washing soda.

soda ash to washing powder 114

Since, washing power contains 10 (ten) water molecules, thus is called sodium carbonate decahydrate.

Properties of washing soda:

  • Sodium carbonate is a crystalline transparent solid.
  • Where most of the carbonates are insoluble in water, sodium carbonate is soluble in water.

Some Uses of sodium carbonate (Washing soda):

  • Sodium carbonate (washing soda) is used as detergent even today in many rural areas.
  • Sodium carbonate (washing soda) is used in making of detergent cake and powder.
  • Sodium carbonate (washing soda) is used in removing of permanent hardness of water.
  • Sodium carbonate (washing soda) is used for making many types of chemicals such as borax.
  • Sodium carbonate (washing soda) is used in glass and paper industries.

    • MCQs Test