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Homework Help: Question about unknown type of metal ion

  1. Oct 9, 2008 #1
    1. The problem statement, all variables and given/known data
    we are mixing CuSo4 (Cu2+) with an iron (Fe) powder and we are trying to determine whether Fe2+ forms or Fe3+
    now the question is :
    suppose that 1.0 g of iron is used in the experiment. what is the minimum volume of Cu2+ solution that must be added in order to completely react the iron? should this calculation be based on the reaction of Fe2+ or Fe3+ with Cu2+?

    2. Relevant equations
    Fe(s) + Cu2+(aq) ---> Fe2+(aq) + Cu(s)
    2Fe(s) + 3Cu2+ ---> 2Fe3+(aq) + 3Cu(s)


    3. The attempt at a solution
    are we supposed to determine which equation uses the least Fe? and if so how are we supposed to change that mass or moles of Cu2+(aq) into volume?
    id really appreciate some help :)
     
  2. jcsd
  3. Oct 10, 2008 #2

    Borek

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    Staff: Mentor

    You need molar concentration of copper sulfate to calculate moles.
     
  4. Oct 10, 2008 #3
    oops sorry to include that its a 1.0M solution cuso4
     
  5. Oct 10, 2008 #4

    Borek

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    Staff: Mentor

    Show how you are approaching the question, it is relatively easy and I have no idea where and why do you get lost.
     
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