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Topic: Why can't aluminum react with HNO3?  (Read 13392 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 »

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 -> ?.

Offline kimi85

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

4Al   +  3O2  --> 2Al2O3

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?

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.
AWK

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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