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Homework Help: EMF and standard electrode potential

  1. Dec 8, 2008 #1
    1. The problem statement, all variables and given/known data
    This question is my translation but there should be all info needed.

    First part:
    Calculate the emf and standard electrode potential of the cell Zn/ZnO/KOH(aq)/Ag2O/Ag

    ZnO(s)+H2O(l)+2e- =>Zn(s)+2OH-(aq) E=-1,26V
    Ag2O(s)+H2O(l)+2e- =>2Ag(s)+OH-(aq) E=0,342V

    Second part(same cell as above)
    T(K): 273K; 291K; 298K; 303K; 309K
    E(V): 1,6160V; 1,6143V; 1,6137V; 1,6132V; 1,6126V

    Calculate emf and change in gibbs energy in temperature 298K.

    2. Relevant equations
    Nerst equation: E=Eo-((RT)/(ZF))*ln K

    3. The attempt at a solution

    First part:
    Zn+Ag2I=>ZnO+2Ag E=1,602V
    I don't know if emf and Standard electrode potential is same thing here. If so then why?

    Second part:
    I don't know if i should use Nerst equation here but how when i don't know K or concentrations yet?
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
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