formation of washing soda
Answers
Washing Soda
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.
Preparation of Washing Soda
Washing soda is synthesized by Solvay’s process. It 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.
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
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