Question

How washing soda can be obtained from baking soda?

Answer 1

Washing Soda - Na2CO3.10H2O

 Baking Soda    - NaHCO3

1) Washing soda can be obtained from sodium chloride.
2) Baking soda is obtained from sodium chloride as follows.

3) On heating, baking soda produces sodium carbonate.

4) Recrystallization of sodium carbonate gives washing soda.


Answer 2

first,
Backing soda is heated;; 2NaHCO_3 ---> Na2CO3 +CO2 +H2O
Now Na2CO3 is made to react with water as
Na2CO3 +10H2O --->Na2CO3.10H2O(Washing soda)