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Topic: Dilute acids in reactions  (Read 1568 times)

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Offline rahulmutt

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Dilute acids in reactions
« on: November 11, 2012, 09:43:08 PM »
Consider the following reaction:

Mg + 2HCl :rarrow: MgCl2 + H2
Fe + H2SO4 :rarrow: FeSO4 + H2

In both cases, dilute acid is used. What happens to the above reactions when you concentrate the acids? Moreover, can something be said in general about the difference between dilute vs concentrated strong acids used as regents in inorganic/organic reactions?
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Offline Hunter2

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Re: Dilute acids in reactions
« Reply #1 on: November 12, 2012, 01:11:34 AM »
The reaction gets stronger.  Probably an oxidizing effect can be obtained. Sulfuric would be reduced to SO2.
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Offline Borek

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Re: Dilute acids in reactions
« Reply #2 on: November 12, 2012, 04:07:26 AM »
Sometimes it won't be that easy. In diluted nitric acid iron will react as expected, but in the concentrated nitric acid it will get passivated and stop to react. So you should be careful about generalizations.
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