Using the following reduction half-reactions and their respective standard reduction potentials at 25 °C,draw a diagram of a galvanic cell.
Cr2O72-(aq) + 14 H+(aq) + 6e- → 2 Cr3+(aq) + 7 H2O(l) E° = +1.33 V
Zn2+(aq) + 2 e- → Zn(s) E° = -0.763 V
A) Zn2+(aq) ∣ Zn(s) ,H+(aq) Cr2O72-(aq) ,Cr(s) ∣ Cr3+(aq)
B) Zn(s) ∣ Zn2+(aq) H+(aq) ,Cr3+(aq) ∣ Cr(s)
C) Cr(s) ∣ Cr3+(aq) ,H+(aq) ,Cr2O72-(aq) Zn(S) ∣ Zn2+(aq)
D) Zn(s) ∣ Zn2+(aq) Cr2O72-(aq) ,H+(aq) ,Cr3+(aq) ∣ Pt(s)
E) Pt(s) ∣ Cr3+(aq) ,Cr2O72-(aq) ,H+(aq) Zn2+(aq) ∣ Zn(s)
Correct Answer:
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