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Write down the preparation method and uses of compound (washing soda).

Posted by Priyanka Nitturkar 5 years, 5 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 5 years, 5 months ago

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.

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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CBSE > Class 10 > Science