Examine the following half-reactions and select the strongest reducing agent among the species listed. PbI₂(s) + 2e⁻ ⇄ Pb(s) + 2I⁻(aq) E° = −0.365 V
Ca²⁺(aq) + 2e⁻ ⇄ Ca(s) E° = −2.868 V
Pt²⁺(aq) + 2e⁻ ⇄ Pt(s) E° = 1.18 V
Br₂(l) + 2e⁻ ⇄ 2Br⁻(aq) E° = 1.066 V

Question

Quizplus · Accepted Answer

The strongest reducing agent is the one that is most easily oxidized, which corresponds to the species with the most negative standard electrode potential (E°). Among the given options, Ca(s) with an E° of −2.868 V is the most easily oxidized, making it the strongest reducing agent.

Examine the Following Half-Reactions and Select the Strongest Reducing Agent