Na2CO3 - Sodium Carbonate

What is Sodium Carbonate?

Na2CO3 is a diazonium salt of carbonic acid. It is also known as Soda crystals, soda ash, washing soda. This inorganic compound is water soluble and when dissolved in water, it forms carbonic acid and sodium hydroxide. In its pure form it is white powder and odorless. It is a strong base and acts as an antacid. Sodium carbonate can be produced by four processes – Solvay process, Labnac process, Dual process, Electrolytic process. Since it is a weak acid it is slightly soluble in ethanol and insoluble in alcohol. One of the important uses of Na2CO3 is as a water softener. PH is about 10.52

Properties of Sodium Carbonate – Na2CO3


Sodium Carbonate

Molecular Weight/ Molar Mass

105.9888 g/mol


2.54 g/cm³

Boiling Point

1,600 °C

Melting Point

851 °C

Sodium Carbonate structure – Na2CO3


Uses of Sodium Carbonate (Na2CO3)

  • It is used in the manufacture of detergents, soaps, paper
  • It is used in as a wetting agent in brick industry
  • It is used as abrasive and foaming agent in toothpaste
  • It is used as a PH modifier
  • It is used as water softener –  Hard water which consists of magnesium and calcium ions are precipitated by carbonate

Learn more about the chemical behavior and importance of Na2CO3 with the expert faculties at BYJU’S.

Practise This Question

What happens to the atomic radii of the group IA elements as we go down the group.