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

Explanation

To understand why the equilibrium constant \( K \) is related only to \( E_{\text{cell}}^{\Theta} \) (the standard cell potential) and not to \( E_{\text{cell}} \) (the actual cell potential), we can follow these steps:

### Step 1: Understand the Nernst Equation
The Nernst equation is given by:
\[ E_{\text{cell}} = E_{\text{cell}}^{\Theta} - \frac{RT}{nF} \ln Q \]
where:
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