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Aluminium vessels should not be washed with materials containing washing soda since
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Washing soda reacts with alluminium to form soluble aluminate
$\begin{aligned} & \mathrm{Na}_2 \mathrm{CO}_3+\mathrm{H}_2 \mathrm{O} \rightarrow 2 \mathrm{NaOH}+\mathrm{CO}_2 \\ & 2 \mathrm{NaOH}+2 \mathrm{Al}+6 \mathrm{H}_2 \mathrm{O} \rightarrow 2 \mathrm{Na}\left[\mathrm{Al}(\mathrm{OH})_4\right]+3 \mathrm{H}_2\end{aligned}$
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