Q5 of 28 Page 14

Sodium hydroxide solution cannot be kept in aluminum containers. Explain.

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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