The electrode potential of a hydrogen electrode (\(P_{H_2}\) = 1 bar) dipped in a solution of pH 3 at 298 K is
A. \(+0.177\) V
B. 0.000 V
C. \(-0.059\) V
D. \(-0.177\) V
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Answer: D. \(-0.177\) V
\(E=-0.0592\,\mathrm{pH}=-0.0592\times3\approx-0.177\) V.
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· 23 Oct 2026
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