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Solution molarity change in electrolytic cell

  1. Jun 30, 2016 #1

    TT0

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    1. The problem statement, all variables and given/known data

    The diagram below shows an electrolysis cell which contains 1L of an aqueous 1M copper(II)sulfate solution.

    upload_2016-6-30_15-43-12.png

    If 0.4 moles of electrons pass through the cell, the concentration of copper ions after passage of the charge will be

    A) 0.4 M

    B) 0.8 M

    C) 1.0 M

    D) 1.2M.

    2. Relevant equations



    3. The attempt at a solution

    I chose C because if 0.4 moles of electrons pass through the cell, then that means 0.2 moles of Cu2+ will be deposited into the solution from the anode and that means 0.2 moles of Cu2+ will be absorbed by the cathode. This gives no net change in molarity in the solution. Is this correct?

    Cheers!
     
  2. jcsd
  3. Jun 30, 2016 #2

    Borek

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    Staff: Mentor

    Looks OK.
     
  4. Jun 30, 2016 #3

    TT0

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    Thanks!
     
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