A platinum electrode is immersed in a solution containing $0.1 \mathrm{M} \mathrm{Fe}^{2+}$ and $0.1 \mathrm{M} \mathrm{Fe}^{3+}$. Its potential is found to be 0.77 V against SHE. Under standard conditions and considering activity coefficients to be equal to unity, the potential of the electrode, when the concentration of $\mathrm{Fe}^{3+}$ is increased to 1M, is ____
Answer
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