Which is the chemical formula of Washing Soda

• GC Acids Bases Salts

Which one of the following is the chemical formula of Washing Soda?

1. NaCO₃
2. Na₂CO₃.10H₂O
3. Na₂CO₃.5H₂O
4. NaOH

Answer

Washing soda is obtained from sodium chloride. Sodium carbonate can be obtained by heating baking soda. Re-crystallisation of sodium carbonate gives washing soda. It is also a basic salt.

Na₂CO₃ + 10H₂O → Na₂CO₃.10H₂O

The correct option is B.