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Soda Ash Light commonly called as washing soda and it’s a sodium salt of carbonic acid. Soda ash is an economic importance chemical because of its applications in manufacturing glass, chemicals, paper, detergents and many other industries. Sodium carbonate commonly occurs in nature in three different forms of hydrates such as sodium carbonate decahydrate (Natron), sodium carbonate heptahydrate and sodium carbonate monohydrate (thermonatrite).

Leblanc method:
Main article: Leblanc method
In 1792, the French chemist Nicolas Leblanc proprietary a method for manufacturing soda ash from salt, vitriol, limestone, and coal. within the initiative, binary compound is treated with vitriol within the urban center method. This reaction produces sulfate (salt cake) and H chloride:

2NaCl + H2SO4 → Na2SO4 + 2HCl
The salt cake and crushed rock (calcium carbonate) was reduced by heating with coal.[15] This conversion entails 2 components. initial is that the carbothermic reaction whereby the coal, a supply of carbon, reduces the sulphate to sulfide:

Na2SO4 + 2C → Na2S + 2CO2
The second stage is that the reaction to supply soda ash and metal sulfide:

Na2S + CaCO3 → Na2CO3 + CaS
This mixture is named hoop ash. The salt is extracted from the hoop ash with water. Evaporation of this extract yields solid soda ash. This extraction method was termed lixiviation. The acid made by the Leblanc method was a serious supply of pollution, and therefore the  metal compound byproduct also given waste disposal problems. However, it remained the most important production technique for soda ash till the late Eighteen Eighties.

Soda Ash due to its wide application is being used globally.