Sodium Hydrogen Carbonate Basic Justify Statement Converted Into Washing Soda Explain

"Sodium hydrogen carbonate is a basic salt." Justify the statement How is it converted into washing soda ? Explain.

Answers:

It is a salt produced by the neutralization reaction between a strong base (NaOH) and a weak acid (H₂CO₃), hence it is a basic salt. 

 It is heated strongly to produce sodium carbonate. 

Sodium carbonate is recrystallized to produce washing soda. 
Na₂CO₃ + 10H₂O → Na₂CO₃.10H₂O.