Under standard conditions the voltaic cell with the reaction H₂ (g) + 2 Fe³⁺→2 Fe²⁺ + 2 H⁺ has a potential of 0.77 V. What is the standard reduction potential for the half-reaction:
Fe³⁺ + e^-→Fe²⁺

Question

Quizplus · Accepted Answer

The overall cell potential is the sum of the potentials for the oxidation and reduction half-reactions. Since the given cell potential is 0.77 V and the reaction involves the transfer of 2 electrons, the reduction potential for the Fe^3+ to Fe^2+ half-reaction is +0.77 V, assuming the standard reduction potential for the other half-reaction (H2 gas formation) is 0 V under standard conditions.

Under Standard Conditions the Voltaic Cell with the Reaction H2

Under Standard Conditions the Voltaic Cell with the Reaction H₂