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Why is equilibrium constant K related to...

Why is equilibrium constant K related to only `E_("cell")^(Theta)` and not `E_("cell")`?

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At equilibrium, `E_(cell)=0`, whereas `E_("cell")^(c-)` is a constant quantity. Hence, `E_("cell")^(c-)=(RT)/(nF)lnK_(c)=(0.059)/(n)logK_(c)`
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