Write the half-reaction that occurs at a hydrogen electrode in acidic aqueous solution when it serves as the anode of a voltaic cell. express your answer as an ionic half-reaction. identify all of the phases in your answer.

The half cell reaction when it used as an anode

H₂(g) → 2 H⁺ + 2 e⁻

Explanation:

Standard hydrogen electrode used as  reference electrode & acts as an cathode as well as anode half cell.

The half cell reaction when it used as an anode

H₂(g) → 2 H⁺ + 2 e⁻

(Pressure should be 1 bar , temperature 273 k and concentration of HCl = 1 Molar)

Cell representation

H₂(g) , H⁺(1 M)

The standard electrode potential i.e oxidation as well as reduction = 0.00 V

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Explanation: