Which of the following correctly states the potential of the SCE relative to the SHE at 25°C?

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Multiple Choice

Which of the following correctly states the potential of the SCE relative to the SHE at 25°C?

Explanation:
Potentials are defined relative to the Standard Hydrogen Electrode, which is set at 0 V. The saturated calomel electrode (SCE) relies on the Hg2Cl2/Hg redox couple in saturated KCl, and its potential at 25°C is fixed by that equilibrium. Experimentally, this potential sits about a quarter of a volt above SHE, commonly given as +0.241 V vs SHE. The exact value can vary slightly with salt concentration and calibration, but +0.241 V is the standard reference for the SCE at 25°C. Since SHE is 0 V, the SCE being +0.241 V means it is more positive with respect to SHE.

Potentials are defined relative to the Standard Hydrogen Electrode, which is set at 0 V. The saturated calomel electrode (SCE) relies on the Hg2Cl2/Hg redox couple in saturated KCl, and its potential at 25°C is fixed by that equilibrium. Experimentally, this potential sits about a quarter of a volt above SHE, commonly given as +0.241 V vs SHE. The exact value can vary slightly with salt concentration and calibration, but +0.241 V is the standard reference for the SCE at 25°C. Since SHE is 0 V, the SCE being +0.241 V means it is more positive with respect to SHE.

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