Using the following standard reduction potentials,
Fe³⁺(aq) + e^- → Fe²⁺(aq) E° = +0.77 V
Ni²⁺(aq) + 2 e^- → Ni(s) E° = -0.26 V
Calculate the standard cell potential for the galvanic cell reaction given below,and determine whether or not this reaction is spontaneous under standard conditions.
Ni²⁺(aq) + 2 Fe²⁺(aq) → 2 Fe³⁺(aq) + Ni(s)

Question

Quizplus · Accepted Answer

To calculate the standard cell potential (E°), we need to add the reduction potential of the reduction half-reaction (Ni²⁺(aq)+ 2 e^- → Ni(s), E° = -0.26 V) to the oxidation potential of the oxidation half-reaction (Fe³⁺(aq)+ e^- → Fe²⁺(aq), E° = +0.77 V). E°cell = E°reduction + E°oxidation E°cell = (-0.26 V) + (+0.77 V) E°cell = -0.98 V Since E°cell is negative, the reaction is nonspontaneous under standard conditions.

Using the Following Standard Reduction Potentials