In a galvanic cell constructed from Pb(s)| Pb⁺²(aq)|| Hg⁺¹| Hg(s),which of the electrodes will gain mass?

Question

Quizplus · Accepted Answer

In a galvanic cell, the anode is where oxidation occurs, which means that electrons are being lost and the electrode itself is being consumed. Similarly, the cathode is where reduction occurs, meaning that electrons are being gained and an electrode in the form of ions is being deposited onto the electrode. In this case, the half-reactions are: Pb(s) → Pb⁺² + 2e- (anode, oxidation) Hg⁺¹ + 2e- → Hg(s) (cathode, reduction) Based on these reactions, it is clear that the cathode will gain mass as Hg⁺¹ ions are being reduced and deposited onto the electrode as solid Hg. Therefore, the answer is D, the cathode, Hg (s).

In a Galvanic Cell Constructed from Pb(s)| Pb+2(aq)|| Hg+1 |

In a Galvanic Cell Constructed from Pb(s)| Pb⁺²(aq)|| Hg⁺¹|