Write the formula of washing soda. How is it prepared? Write its three

1.	Write the formula of washing soda. How is it prepared? Write its three uses.
Answer» Washing soda (Na₂CO₃.10H₂O) is hygroscopic in nature because of which it absorbs moisture from the air and therefore water of crystallization is attached to its formula. It is a basic salt. 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 2NaHCO₃ ⇾ Na₂CO₃ + H₂O + CO₂ Na₂CO₃ + 10H₂O ⇾ Na₂CO₃.10 H₂O Uses: (i) used in glass, soap and paper industries, (ii) used in the manufacture of sodium compounds such as borax, (iii) used for removing permanent hardness of water.

Write the formula of washing soda. How is it prepared? Write its three uses.

Answer»

Washing soda (Na₂CO₃.10H₂O) is hygroscopic in nature because of which it absorbs moisture from the air and therefore water of crystallization is attached to its formula. It is a basic salt.

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

2NaHCO₃ ⇾ Na₂CO₃ + H₂O + CO₂

Na₂CO₃ + 10H₂O ⇾ Na₂CO₃.10 H₂O

Uses: (i) used in glass, soap and paper industries,

(ii) used in the manufacture of sodium compounds such as borax,

(iii) used for removing permanent hardness of water.

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