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A silver electrode is immersed in a 0.1 M AgNO3 solution at 25 deg C. Which expression gives the reduction potential of this silver electrode?

1. E°red
2. (E°red + 0.059)
3. (E°oxi - 0.059)
4. (E°red - 0.059)

Correct answer: (E°red - 0.059)

Solution

The electrode potential of Ag+/Ag depends on the Ag+ concentration through the Nernst equation. Since the ion concentration (0.1 M) is below the standard 1 M, the actual reduction potential is lower than E°red by 0.059 V.

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