Why is it iron 2 and not iron 3?

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SUMMARY

The discussion clarifies why iron predominantly forms iron(II) chloride (FeCl2) rather than iron(III) chloride (FeCl3) when reacting with hydrochloric acid (HCl). The reaction is represented by the equation Fe + 2HCl → FeCl2 + H2. The key factor is the redox potential of hydrogen ions (H+), which is insufficient to oxidize iron to the +3 oxidation state. Therefore, iron typically exists in the +2 oxidation state in this context.

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Why is it iron 2 and not iron 3?

Hi all

Upon the reaction of Hydrochloric acid with Iron.. the following equation represents the reaction:

Fe + 2HCl -------> FeCl2 + H2


Why isn't the product FeCl3? I don't understand what makes it not possible for iron to form this chloride salt.. why isn't the equation:

2Fe + 6HCl --------> 2FeCl3 + 3H2
 
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You will have to compare redox potentials to see the reason. H+ is not an oxidizer strong enough to oxidize iron beyond 2+.
 


tahnx
 

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