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The formula of soda ash is
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Verified Answer
The correct answer is:
$\mathrm{Na}_2 \mathrm{CO}_3$
$\mathrm{Na}_2 \mathrm{CO}_3$
On heating washing soda, it loses its water of crystallisation. Above $373 \mathrm{~K}$, it becomes completely anhydrous white powder called soda ash.
$$
\begin{aligned}
&\mathrm{Na}_2 \mathrm{CO}_3 \cdot 10 \mathrm{H}_2 \mathrm{O} \stackrel{\text { Above } 373 \mathrm{~K}}{\longrightarrow} \quad \mathrm{Na}_2 \mathrm{CO}_3 \\
&\text { Washing soda } \\
&\text { Soda ash } \\
&\text { (Anhydrous form) } \\
&
\end{aligned}
$$
$$
\begin{aligned}
&\mathrm{Na}_2 \mathrm{CO}_3 \cdot 10 \mathrm{H}_2 \mathrm{O} \stackrel{\text { Above } 373 \mathrm{~K}}{\longrightarrow} \quad \mathrm{Na}_2 \mathrm{CO}_3 \\
&\text { Washing soda } \\
&\text { Soda ash } \\
&\text { (Anhydrous form) } \\
&
\end{aligned}
$$
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