State the number of water molecules present in crystals of washing soda and Plaster of Paris. What are these water molecules called?
(N/A) $(i)$ Washing soda contains $10$ molecules of water of crystallisation $(Na_2CO_3 \cdot 10H_2O)$. Plaster of Paris contains $1/2$ molecule of water of crystallisation $(CaSO_4 \cdot 1/2H_2O)$.
$(ii)$ These water molecules are known as water of crystallisation.
$(ii)$ These water molecules are known as water of crystallisation.
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