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Can acid be used to catalyze the formatin of Iron (III) ion (aqueous)?

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From what I have gathered, it appears that the reaction between Iron and certain acids can produce either Fe2+ OR Fe3+ ions. For example, I believe that HCl and Fe(s) will produce hydrogen and either FeCl2(aq) AND/OR FeCl3(aq).

Similiarly, the reaction between Fe(s) and H2SO4 will produce hydrogen and Iron (II) sulfate(aq) AND/OR iron (III) sulfate(aq).

I want to know the conditions (i.e. molarity, temp., pressure ect.) that will favor the relatively rapid formation of the iron (III) ion.

Remember, I want the Iron (III) ion to be aqueous (soluble in solution).

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Adding concentrated sulfuric acid to iron, preferably in powdered or filing form will yield the following reaction:

2Fe (s) + 6H2SO4 (aq) --> Fe2(SO4)3 + 3SO2 (g) + 6H2O (l)

Approximately 1 gram of iron per 10 mL of concentrated sulfuric acid should yield a fast reaction resulting ...

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