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Voltaric Cell/Cell Chemical Reaction

  1. Apr 13, 2010 #1
    1. The problem statement, all variables and given/known data

    9vbkuc.jpg

    Which of the following are true statements about the above voltaric cell and the resulting cell chemical reaction ?

    a) The zinc electrode is the cathode

    b) Zinc will be consumed before copper

    c) Electrons flow from the copper electrode to the zinc electrode

    d) The half reaction for the anode is Cu2+(aq) + 2e− → Cu(s)

    e) The species SO42− does not take part in the cell reaction


    3. The attempt at a solution

    i know a is false because zinc is the anode.
    i know c is false because electrons flow from the zinc to the copper & ions flow from the copper to the zinc
    i know d is false because the half reaction is the Oxidation at the anode Zn(s) --> Zn2+(aq) + 2e-
    i believe e is true

    ===========
    Reduction at the cathode
    2H3O+(aq) + 2e --> H2(g) + 2H2O(l)
    ===========
    any other help with this?

    Thanks
     
    Last edited: Apr 13, 2010
  2. jcsd
  3. Apr 13, 2010 #2

    Borek

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    Staff: Mentor

    We can't see the picture.

    You are right about electrons, but what ions?

    You need two half reactions, so far you have listed one only - zinc oxidation. Something must be reduced at the same time.

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    methods
     
  4. Apr 13, 2010 #3

    Gokul43201

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    Staff Emeritus
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    Gold Member

    You haven't told us what the cell is! Is it: Zn | ZnSO4 || CuSO4 | Cu ? Or something else?

    Use the above notation if the cell is different from the one above.

    EDIT: Simul-posting with Borek!
     
  5. Apr 13, 2010 #4
    you're right, 'e' is true.

    Source: LUCID
     
  6. Apr 13, 2010 #5
    updated this with the pic....and the second half reaction
     
  7. Apr 13, 2010 #6

    Borek

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    Staff: Mentor

    Ok, now, what ions flow from the copper to zinc?

    Is copper electrode consumed in the cell?

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  8. Apr 13, 2010 #7
  9. Apr 13, 2010 #8

    Borek

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    Staff: Mentor

    These flow from zinc to copper.

    Ignoring the other question won't get you far - you have to answer it to answer b.

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  10. Apr 13, 2010 #9
    I believe the copper is consumed to answer Borek's question.

    -1-
     
  11. Apr 13, 2010 #10
    B is true as well as E, thank you for your help
     
  12. Apr 13, 2010 #11

    Borek

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    Staff: Mentor

    How?

    What does 'consumed' mean in this context?

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    methods
     
  13. Apr 13, 2010 #12
    Why is it that zinc is consumed? I don't see how it is consumed...the anode is still present even though it is oxidized...
     
  14. Apr 14, 2010 #13

    Borek

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    Staff: Mentor

    No, zinc - once oxidized - gets into the solution in the form of ions. If you wait long enough, anode will simply dissapear.

    --
    methods
     
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