Sodium hydroxide solution cannot be kept in aluminum containers because:
i. Aluminum being more reactive than sodium, reacts with sodium and displaces it from its hydroxide and forms a new compound, i.e., aluminum hydroxide.
ii. The reaction takes place is given as:
Al + NaOH + 6H2O → 2Na + 2[Al(OH)4] + 3H2
iii. As a result, small pores are formed on the walls of the container.
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