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Question

(A) Aluminium vessels should not be washed with materials containing washing soda $(Na_{2}CO_{3})$ because it reacts with aluminium to form soluble al

Vedclass · Accepted Answer

washing soda reacts with aluminium to form soluble aluminate

Vedclass · Answer

(A) Aluminium vessels should not be washed with materials containing washing soda $(Na_{2}CO_{3})$ because it reacts with aluminium to form soluble aluminate.Under normal circumstances,aluminium does not react with water,as an impermeable protective layer of aluminium oxide $(Al_{2}O_{3})$ or aluminium hydroxide $(Al(OH)_{3})$ forms on its surface.When washing soda is used,it hydrolyzes to produce sodium hydroxide $(NaOH)$. The $NaOH$ reacts with the protective layer and the aluminium metal,preventing the formation of a protective layer and dissolving the metal by forming soluble sodium aluminate,$Na[Al(OH)_{4}]$.The reaction is as follows:$2Al + 2NaOH + 6H_{2}O \rightarrow 2Na[Al(OH)_{4}] + 3H_{2}$

Aluminium vessels should not be washed with materials containing washing soda because

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