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Why equilibrium constant is related to E...

Why equilibrium constant is related to `E_("cell")^(c-)` but not to `E_("cell")` ?

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At the equilibrium point, `E_(cell)`=zero. Therefore, K is related to `E_(cell)^(@)` as ,
`logK_(c)=(n)/((0.0591V))E_(cell)^(@)`.
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