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Could you help me with this electrolysis equation?

  1. Nov 2, 2015 #1
    1. The problem statement, all variables and given/known data
    Write the water electrolise of NaOH.

    2. Relevant equations
    NaOH+H2O->H2+O2+NaOH

    3. The attempt at a solution
    2NaOH+2H2o->2H2+O2+2NaOH
    I thought to write 2H2O->2H2+O2
    If I am given the mass of NaOH (which in one problem I am), then how am I supposed to find the mas of H2O for example?
    Is it right to write this way
    2NaOH+2H2o->2H2+O2+2NaOH
    or
    NaOH+2H2o->2H2+O2+NaOH?
     
  2. jcsd
  3. Nov 2, 2015 #2

    Borek

    User Avatar

    Staff: Mentor

    NaOH is just a spectator, it doesn't react. What it does it increases the solution conductivity.

    Amount of gases produced doesn't depend on the amount of NaOH (at least not stoichiometrically), instead it is given by Faraday's law.
     
  4. Nov 2, 2015 #3
    I am given the mass of NaOH 40g. I have to find the mass of substances added in cathode and anode. How can I find it?
     
  5. Nov 2, 2015 #4

    Borek

    User Avatar

    Staff: Mentor

    You can't, there is not enough information.
     
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