Question

the number of molecules of water of crystallization in washing soda is _ _
_ _​

Answer 1

Washing soda has 10 water molecules as water of crystallisation. Water of crystallisation is the fixed number of water molecules present in one formula unit of a salt. When washing soda is exposed to air, it loses 9 molecules of crystallisation and becomes sodium carbonate monohydrate.

Answer 2

10 is the correct answer