hydrogen half cell

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A type of half cell in which a metal foil is immersed in a solution of hydrogen ions and hydrogen gas is bubbled over the foil. The standard hydrogen electrode, used in measuring standard electrode potentials, uses a platinum foil with a 1.0 M solution of hydrogen ions, the gas at 1 atmosphere pressure, and a temperature of 25°C. It is written Pt(s)|H2(g), H+(aq), the effective reaction being H2 → 2H++2e.

H2 → 2H++2e.

Subjects: Chemistry — Physics.

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