Question

2al + 3sn²⁺ → 2al³⁺ + 3sn
in the voltaic cell above, which letter represents the cathode half - cell?

Explanation:

Step1: Recall cathode definition

In a voltaic cell, cathode is where reduction occurs (gain of electrons).

Step2: Analyze the reaction

Given reaction: \(2\text{Al} + 3\text{Sn}^{2+}
ightarrow 2\text{Al}^{3+} + 3\text{Sn}\). The reduction half - reaction is \(\text{Sn}^{2+}+2e^-
ightarrow\text{Sn}\) (since \(\text{Sn}^{2+}\) gains electrons to form \(\text{Sn}\)).

Step3: Identify the electrode with \(\text{Sn}\)

The \(\text{Sn}\) electrode is in beaker A. So the cathode half - cell is represented by letter A.

Answer:

A