ElectrochemistryHard

Question

Given standard electrode potentials :
Fe3+ + 3e- →  Fe ;     Eo = - 0.036 volt
Fe2+ + 2e- →  Fe;    Eo = - 0.440 volt
The standard electrode potential Eo for     Fe3+ + e- →  Fe2+

Options

A.-0.476 volt
B.-0.404 volt
C.0.404 volt
D.0.772 volt

Solution

Fe3+ + 3e-   → Fe , - 0.036 volt
Fe → Fe2+ + 2e-, 0.44 volt
Fe3+  → + e- Fe2+
+ 3 × 0.036f - 2 × 0.44 × f  = - 1 × Eo ×  f
Eo = 0.772 Volt

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