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Topic: Why can't aluminum react with HNO3?  (Read 14404 times)

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Offline kimi85

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Why can't aluminum react with HNO3?
« on: July 22, 2007, 01:25:19 AM »
Why can't aluminum react with HNO3?

Is it because aluminum can form hydrates? Thanks!
« Last Edit: July 23, 2007, 02:15:42 AM by Mitch »
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Offline enahs

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Re: Aluminum
« Reply #1 on: July 22, 2007, 11:26:55 AM »
Aluminum is highly reactive with air. It forms a fairly chemically inert protective coating around the aluminum metal that is exposed to air. What is this coating and write the balanced chemical equations for Al + O2 -> ?.
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Offline kimi85

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Re: Aluminum
« Reply #2 on: July 22, 2007, 11:05:17 PM »

4Al   +  3O2  --> 2Al2O3
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Offline kimi85

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Re: Aluminum
« Reply #3 on: July 22, 2007, 11:06:49 PM »
thanks..so, aluminum oxide is the coating? and is the reason why aluminum cant react with nitric acid?
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Offline AWK

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Re: Why can't aluminum react with HNO3?
« Reply #4 on: July 23, 2007, 02:21:15 AM »
Aluminium reacts with diluted HNO3. When concentrated HNO3 is use passivation occurs, ie HNO3 oxidizes surface of Al to Al2O3 which in turn is insoluble in concentrated HNO3.
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Offline kimi85

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Re: Why can't aluminum react with HNO3?
« Reply #5 on: July 23, 2007, 03:55:00 AM »
thank you very much!  ;D
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