Question

explain the preparation of washing soda from baking soda using equation.list any two uses of washing soda other than washing clothes​

Answer 1

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Explanation:

Washing soda is a whitish, odourless powder. Its chemical formula is Na2CO3 and is better known as sodium carbonate. It is hygroscopic in nature that is, it absorbs moisture from the air. It is highly soluble in water and forms strongly alkaline water solution.

Washing soda is synthesized through Solvay’s process. Solvay’s process involves the reaction of sodium chloride, ammonia and carbon dioxide in water. Carbon dioxide involved is produced through calcium carbonate and the calcium oxide left is used in recovering ammonia from ammonium chloride.

PREPARATION:

At first, sodium bicarbonate is obtained which is then converted to sodium carbonate on heating. Finally, washing soda is produced by recrystallization of sodium carbonate.

NaCl + NH3 + CO2 + H2O → NaHCO3 + NH4Cl

2 NaHCO3 → Na2CO3 + H2O + CO2

Na2CO3 + 10H2O → Na2CO3.10H2O

USES:

Washing soda is used for removing burnt-on grease from kitchen utensils.

It is prominently used in soap, glass and paper industries.

It also helps in the removal of permanent hardness of the water.

It acts as a raw material in the manufacturing of various sodium compounds, for example, borax.