We’re being asked to determine the strongest reducing agent among the given species. The reducing agent is the species that are being oxidized in a redox reaction. Recall the mnemonics LEO GER.
Loss Electrons → Oxidation → Reducing Agent
Gain Electrons → Reduction → Oxidizing Agent
The strongest reducing agent would be the element that would be easily oxidized or easily loses an electron:
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
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