why sodium hydroxide can not be stored in aluminium containers ?

Al is more reactive than Na so a displacement reactin takes place between the Al and NaOH in which and Al displaces Na from NaOH and small pores are formed in the container

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Sodium hydroxide in contact with some metals (aluminum, magnesium, and zinc) reacts to produce flammable and potentially explosive hydrogen gas. Aluminium is actually a very reactive metal that is unusual as it has layer of oxide (Al2O3) on the surface. This oxide is soluble in base forming an aluminate exposing the aluminum surface which then reacts.

hope it helpz !!!


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