A voltaic cell is based on a Co²⁺/Co half-cell and an Ag¹⁺/Ag half-cell. Given E ° _red(Co²⁺/Co) = - 0.277 V and E ° _red(Ag¹⁺/Ag) = +0.222 V, which statement below is true regarding which half cell operates at the positive electrode and what is the standard cell potential E ° _cell for this voltaic cell?

Question

Quizplus · Accepted Answer

The Ag¹⁺/Ag half-cell has a more positive standard reduction potential (+0.222 V) than the Co²⁺/Co half-cell (-0.277 V). In a voltaic cell, the half-cell with the more positive standard reduction potential operates at the positive electrode. Therefore, the Ag¹⁺/Ag half-cell operates at the positive electrode. The standard cell potential E ° _cell can be calculated using the formula: E ° _cell = E ° _red(Ag¹⁺/Ag) - E ° _red(Co²⁺/Co) Plugging in the values: E ° _cell = (+0.222 V) - (-0.277 V) = +0.499 V. Therefore, the correct answer is D.

A Voltaic Cell Is Based on a Co2+/Co Half-Cell and an Ag1+/Ag

A Voltaic Cell Is Based on a Co²⁺/Co Half-Cell and an Ag¹⁺/Ag