The ease to remove an electron from an element is also related to cell potential.
• Smaller (↓) E° → oxidation → weaker oxidizing agent
• Larger (↑) E° → reduction → stronger oxidizing agent
Zn2+ + 2 e‒ ⇌ Zn E° = ‒0.7618 V
Fe3+ + 3 e‒ ⇌ Fe E° = ‒0.037 V
Ca2+ + 2 e‒ ⇌ Ca E° = ‒2.868 V
• lower E° than Zn2+/Zn and Fe3+/Fe
• Ca2+ → will not oxidize both Zn and Fe
Which of the following reagents would oxidize Zn to Zn2+, but not Fe to Fe3+
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