9. The standard reduction potential of Pb and Zn electrodes are -0.126 V and -0.763 V respectively. — Electrochemistry Chemistry Question
Question
9. The standard reduction potential of Pb and Zn electrodes are -0.126 V and -0.763 V respectively. The EMF of the cell Zn / $Zn_2$+(0.1 M) // $Pb_2$+(1.0 M) / Pb at 25 C is:
Answer: C
💡 Solution & Explanation
$E^\circ = -0.126 - (-0.763) = 0.637 V$. Nernst: $E = 0.637 - (0.0591/2) \log(0.1 / 1.0) = 0.637 - (0.02955 \times -1) = 0.637 + 0.02955 = 0.6665 V \approx 0.667 V$.
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