Question

The number of molecules of water of crystallisation present in washing soda crystals is ______.

Options

• five

• two

• ten

• seven

Answer 1

The number of molecules of water of crystallisation present in washing soda crystals is ten.

Explanation:

The chemical formula of washing soda is Na₂CO₃.10H₂O. The water molecules that form part of a salt’s structure are called its water of crystallisation. Hence, the number of water molecules of crystallisation present in washing soda crystals is 10.