How does aluminium and nitric acid react? - Quora

Although aluminium reacts with dilute nitric acid to produce aluminium nitrate and hydrogen gas, concentrated (>60%) nitric acid is such a powerful oxidising agent that it instantly causes a thin layer of aluminium oxide to coat the surface of the aluminium. The oxide coating is resistant to nitric acid attack and therefore prevents any further reaction. This process is called passivation and also occurs with chromium, cobalt, iron and nickel. 4HNO3 + Al → 2H2O + NO + Al(NO3)3 It produce brown fumes and that is nitrogen oxide and it is very toxic so be careful when doing this experiment ! Hopes this helps:) 4HNO3 + Al → 2H2O + NO + Al(NO3)3 It produce brown fumes and that is nitrogen oxide and it is very toxic so be careful when doing this experiment ! Hopes this helps:) I think that there would be no such reaction because Al when comes in contact with HNO3 forms a flaky layer of its oxide (Al2O3) preventing the metal from further oxidation Why can nitric acid not react with aluminium

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