An Intriguing Electrochemical Cell Experiment

What is the overall electric cell potential of the electrochemical cell?

Which value represents the overall electric cell potential?

A. –0.13 V

B. –0.93 V

C. +0.67 V

D. +0.93 V

Answer:

+ 0.93V

The overall electric cell potential of the electrochemical cell is +0.93V. This value is obtained by calculating the difference between the standard reduction potentials (Eo) of the cathode and anode half-reactions.

For the given half-reactions:

  • Ag⁺(aq) + e⁻ → Ag(s) Eo = +0.80 V
  • Pb²⁺(aq) + 2e⁻ → Pb(s) Eo = –0.13 V

By combining the half-reactions, we get:

  • 2Ag⁺(aq) + 2e⁻ → 2Ag(s) Eo = +0.80 V
  • Pb(s) → Pb²⁺(aq) + 2e⁻ Eo = +0.13 V
  • 2Ag⁺(aq) + Pb(s) → 2Ag(s) + Pb²⁺(aq)

Using the formula Ecell = Eo cathode - Eo anode, we find:

Ecell = 0.80V - (- 0.13V) = 0.80V + 0.13V = +0.93V

Therefore, the overall electric cell potential of the electrochemical cell is +0.93V.

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