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Electrode Potential

Calculate the...

Question

Calculate the reduction potential of a half cell consisting of a platinum electrode immersed in $2.0 M F e^{2}$ and $0.02 M F E^{3}$ solution. Given $E_{F e^{3} / F e^{+ 2}}^{0} = 0.771 V$ .

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Solution

${F e}^{3 +} + e^{-}$ $\to F e^{2 +}$
$E = E^{0} - \frac{0.0591}{1}$ $log \frac{[{F e}^{2 +}]}{[{F e}^{3 +}]}$ $= 0.771 - 0.0591 log (\frac{2}{0.02})$
$∴ E = 0.6528 v o l t$

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