Question

write steps involved in the formation of washing soda from sodium chloride and also write chemical name of washing soda


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Answer 1

Answer:

In the following three steps, washing soda is prepared from sodium chloride or common salt.

Explanation:

Firstly, a cold and concentrated sodium chloride solution is reacted with ammonia and carbon dioxide to obtain sodium hydrogen carbonate.

NaCl +NH3 +CO2 +H2O → NaHCO3 +NH4Cl

Secondly, now sodium hydrogen carbonate is separated by filtration, dried and heated. On heating sodium hydrogen carbonate decomposes to form sodium carbonate. This anhydrous sodium carbonate is known as soda ash.

2NaHCO3 → Na2CO3 +H2O +CO2

soda ash

Thirdly, anhydrous sodium carbonate or soda ash is dissolved in water and recrystallised to get washing soda crystals containing 10 molecules of water of crystallisation.

Na2CO3 + 10H2O → Na2CO3.10H2O

Washing Soda