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Q. When washing soda is heated:

The s-Block Elements

Solution:

Washing soda is sodium carbonate decahydrate $\left( Na _{2} CO _{3} .10 H _{2} O \right)$

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But on heating above $373 K$ it loses all the water molecules to form anhydrous sodium carbonate or soda ash

$Na _{2} CO _{3} \cdot H _{2} O \stackrel{\Delta}{\longrightarrow } \underset{\text{Soda ash}} {Na _{2} CO _{3}+ H _{2} O}$