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Homework Help: Cell diagrams - how to draw them

  1. May 9, 2012 #1
    1. The problem statement, all variables and given/known data
    attachment.php?attachmentid=146664&d=1336583430.png


    2. Relevant equations



    3. The attempt at a solution

    I always thought you put the electrolyte of one half cell on one side and the other electrolyte on the other side

    The answer given is C.
    But this includes VO2+ which is not in the initial eqn on the RHS?
     
    Last edited: May 9, 2012
  2. jcsd
  3. May 9, 2012 #2

    Borek

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    Staff: Mentor

    Try to split the reaction into half reactions.
     
  4. May 10, 2012 #3
    V3+ + H2O = VO2+ + 2H+
    VO2+ + H2o = VO2+ + 2h+
     
  5. May 10, 2012 #4

    Borek

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    Staff: Mentor

    They are not balanced yet (you ignored electrons), but you are on the right track.

    Do you see why C?
     
  6. May 10, 2012 #5
    Well V3+ is oxidised (reducing agent) and VO2+ is reduced (oxidising agent).
    I think you are supposed to put the stronger reducing agent on the left side?
     
  7. May 10, 2012 #6

    Borek

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    Staff: Mentor

    Isn't it what they did?
     
  8. May 10, 2012 #7
    ...of course....I think I just get confused between VO2+ and VO2+.

    ...I guess though this will help me in exams as I will be more aware of what is going on....thanks for helping me :)
     
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