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Thread: sulfuric acid + iron (ll) oxide > ?

  1. #1 sulfuric acid + iron (ll) oxide > ? 
    Forum Freshman
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    Feb 2011
    Hi, I am confused over iron, iron (ii), iron (iii), when do I need to change them when doing an equation?

    Why is Iron + hydrochloric acid > iron (ii) chloride + hydrogen, not iron chloride + hydrogen?


    Last edited by Mphisto; October 4th, 2011 at 11:27 AM.
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  3. #2  
    Forum Freshman jsloan's Avatar
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    Nov 2010
    The explanation for what charge to assign the Fe atom lies in the balanced equation for the reaction:

    Fe (s) + 2 HCl (aq) ---> FeCl2 (aq) + H2 (g)

    Each Fe atom is bonding with two Cl atoms on the product side of the reaction. With a total charge of -2 for those two Cl atoms (each of the two Cl atoms has a charge of -1), the charge on the Fe atom has to become +2 on the product side in order to balance the charge on the two Cl atoms and end up with a net zero charge on the FeCl2 molecule. That's why you end up with Fe(II)Cl2 on the product side in this reaction.

    Last edited by jsloan; October 11th, 2011 at 10:05 AM.
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