The Nernst equation is
Ecell = Eocell + (0.05916/n)*log(reduced/oxidized)
As the concn changes, the reduced form and oxidized form changes, that changes the log and adds or subtracts from Eocell. By adding and/or subtracting from Eocell with concn, it is possible to make the cell "go the other direction," meaning it changes sign.
Explain with reference to the Nernst equation, how is it possible for a cell to have a positive cell potential understandard conditions but the negative cell potential under other conditions.
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