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Thread: Electrochemical Cell equations

  1. #1 Electrochemical Cell equations 
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    Hi all,

    Finding this question very hard.

    Here is a cell:
    I2(aq), I-(aq) | Pt +0.54V
    Fe2+(aq) | Fe(s) -0.44V


    Here is my cell diagram and emf value:
    Fe2+(aq) | Fe(s) ⁞ I2(aq), I-(aq) | Pt

    emf = E(cell) = E(RHS) E(LHS)
    emf = E(cell) = (+0.54) (-0.44)
    emf = E(cell) = +0.98V



    I am now tasked with writing balanced ionic equations that occur when the cell is discharged.

    Any help would be very much appreciated. Thanks.


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  3. #2  
    Bullshit Intolerant PhDemon's Avatar
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    Well what is going on is:

    Fe = Fe2+ + 2e-

    I2 + 2e- = 2I-

    Combining them:

    Fe + I2 = Fe2+ + 2I- = FeI2

    is this what you are meaning?


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  4. #3  
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    Yes, thanks. What is the Platinum doing?
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  5. #4  
    Bullshit Intolerant PhDemon's Avatar
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    It doesn't seem to be doing much...

    Is it what the electrodes are made of?

    (My electrochemistry is very rusty, I studied this ~20 years ago and haven't thought about it much since...)
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  6. #5  
    Moderator Moderator Cogito Ergo Sum's Avatar
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    Quote Originally Posted by JackAnimated View Post
    Yes, thanks. What is the Platinum doing?

    Nothing.
    It functions as an inert electrode since it does not take part in the chemical reactions provided in post #2.
    "The only safe rule is to dispute only with those of your acquaintance of whom you know that they possess sufficient intelligence and self-respect not to advance absurdities; to appeal to reason and not to authority, and to listen to reason and yield to it; and, finally, to be willing to accept reason even from an opponent, and to be just enough to bear being proved to be in the wrong."

    ~ Arthur Schopenhauer, The Art of Being Right: 38 Ways to Win an Argument (1831), Stratagem XXXVIII.
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  7. #6  
    Bullshit Intolerant PhDemon's Avatar
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    Quote Originally Posted by Cogito Ergo Sum View Post
    Quote Originally Posted by JackAnimated View Post
    Yes, thanks. What is the Platinum doing?

    Nothing.
    It functions as an inert electrode since it does not take part in the chemical reactions provided in post #2.
    I was pretty sure that was the case but I'm a bit rusty on this stuff...
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  8. #7  
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    Thanks you folks. So this equation represents the discharge of the cell?

    Fe + I2 = Fe2+ + 2I- = FeI2


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