Question

Standard hydrogen electrode is represented by

Options:

Pt(s) |H2(g, 1 bar)| H+(aq, 1 M)

Pt(s) |H2(g, 2 bar)| H+(aq, 1 M)

Pt(s) |H2(g, 1 bar)| H+(aq, 2 M)

Pt(s) |H2(g, 2 bar)| H+(aq, 2 M)

Answer 1

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Answer...

correct option is 1.Pt(s) |H2(g, 1 bar)| H+(aq, 1 M)

Standard hydrogen electrode (SHE) os an electrode that is used for reference in half cell potential reactions.

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Answer 2

Answer:

Standard hydrogen electrode is represented by:

Pt(s) | H₂(g, 1bar) | H⁺(aq, 1M)

Therefore the option (1) is correct.

Explanation:

• When Hydrogen gas at pressure 1 atm is adsorbed over platinum surface electrode dipped one molar of HCl solution at temperature 298K is called standard hydrogen electrode.

• It is represented as SHE.

• The standard electrode potential of standard electrode potential is equal to zero i.e. E⁰cell =0.

• standard hydrogen electrode is used as reference electrode to calculate the electrode potential of other electrodes.

• Platinum is used to provide the surface for the reaction. Because Pt is inert, does not poison another half cell's electrode.