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standard electrode potentials

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    what does that mean:

    standard electrode potentials apply to aq equilibria-does that mean all reactants and products have to be aq or does it only have too contain one which is aq.????
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    (Original post by koat)
    what does that mean:

    standard electrode potentials apply to aq equilibria-does that mean all reactants and products have to be aq or does it only have too contain one which is aq.????
    Hmmm, could you supply the full quote ?

    All electrode potentials are measured relative to the standard hydrogen electrode.

    In the SHE hydrogen gas is being used.

    So, I believe that your statement is flawed.
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    No not all the species have to be in the aqueous phase. Eg the cu/cu2+ electrode which will be a solid copper electrode and a solution of cu2+, eg cuso4

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