Problem: Which of the following reagents would oxidize Zn to Zn2+, but not Fe to Fe3+a) Ca2+b) Br2c) Cod) Cae) Br-f) Co2+

FREE Expert Solution

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


Given:

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

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Problem Details

Which of the following reagents would oxidize Zn to Zn2+, but not Fe to Fe3+

a) Ca2+

b) Br2

c) Co

d) Ca

e) Br-

f) Co2+

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