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Electrolytic Purification of Nickel

  1. Apr 28, 2012 #1
    1. The problem statement, all variables and given/known data

    Page 7 Part (c) is where I'm having some doubts. The nickel question.

    2. Relevant equations

    Ni2+/Ni = –0.25V
    Fe2+/Fe = –0.44V

    3. The attempt at a solution

    I believe that since the electrode potentials are quite negative (see above) then both Nickel and Iron will go into solution as ions.

    Furthermore, only Nickel would be deposited at the Cathode due to its more positive potential relative to Iron.

    However, the mark scheme seems to be implying that only the Fe goes into solution. This is what it says word for word :

    Am I correct ?
  2. jcsd
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