Explain why concentrated HNO3 can be stored in aluminium containers?

Question

plz i need it sooooon

Answer 1

Concentrated HNO3 acts less like an acid than the same acid with the right amount of water and will not strip the oxide layer of the aluminium container. If it had a plastic liner the HNO3 would burn through it.

Some aluminium containers used for corrosive substances are pretreated with fluorine to give a fluoride layer instead.

Answer 2

These containers usually have a plastic coating covering the entire inside.

The Al2O3 coatings WILL dissolve in concentrations of aqueous Nitric acid more dilute than about 90% HNO3.  

Al2O3 (s)  + 6 HNO3 (aq) ---> 2 Al(NO3)3 (aq)  + 3 H2O

Concentrations above 90% HNO3 are so strongly oxidizing that they do not react with the Aluminum oxide coating.  Aluminum storage tanks for industrial sites have been used, but do have problems when cleaning for inspection.

Stainless steel tanks with Teflon (PTFE) or Epoxide coatings are usually considered the best and the safest.

Answer 3

The surface of Al containers is actually Al2O3 which does not react with HNO3

Answer 4

Actually

The surface of Al containers is actually Al2O3 which does not react with HNO3

Answer 5

one possible explanation can be aluminium forms a protective layer of Al2O3 which prevents metal from the interior from reacting with the nitric acid.