Question

State in brief the preparation of washing soda from baking soda. Write balanced chemical equation of the reaction involved.

Answer 1

Sodium hydrogencarbonate (baking soda) on heating gives sodium carbonate which on recrystallisation gives washing soda.

Baking soda on heating gives sodium carbonate which on crystallisation from aqueous solution gives washing soda, e.g.

Na₂CO₃ + 10H₂O → Na₂CO₃ . 10H₂O