Electrode with mercureux sulfate

The electrode with the mercureux Sulfate saturated with K₂SO₄, is a electrode of reference. It utilizes the following redox cells:

Hg/Hg₂SO₄/saturated K₂SO₄.

The potential taken by the electrode depends only on the concentration in ions sulfates. The potential of the electrode with mercureux sulfate is thus fixed by the concentration of the solution of K2SO4 in which it bathes: concentration molar, décimolaire, or saturated. The potential with 25 °C of the Hg/Hg2SO4/K2SO4 electrode saturated compared to the normal electrode with hydrogen is:

0,6513 V ENH

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