The standard cell potential (E°_cell)for the voltaic cell based on the reaction below is __________ V. Cr (s)+ 3Fe³⁺ (aq)→ 3Fe²⁺ (aq)+ Cr³⁺ (aq) A)-1.45 B)+2.99 C)+1.51 D)+3.05 E)+1.57

Question

Quizplus · Accepted Answer

To find the standard cell potential, we need to use the standard reduction potentials of each half-cell reaction. Looking at the reduction potentials table, we can find the reduction potentials for each half-reaction:

Cr3+(aq) + 3e- → Cr(s)   E° = -0.74 V
Fe3+(aq) + e- → Fe2+(aq)  E° = +0.77 V

To calculate the overall potential, we need to subtract the reduction potential of the anode from the reduction potential of the cathode:

E°cell = E°cathode - E°anode
E°cell = (+0.77 V) - (-0.74 V)
E°cell = +1.51 V

Therefore, the standard cell potential for this voltaic cell is +1.51 V, which corresponds to answer choice C.

The Standard Cell Potential (E°cell)for the Voltaic Cell Based on the Reaction

The Standard Cell Potential (E°_cell)for the Voltaic Cell Based on the Reaction