Hydrogen Electrode and Electrode Potential

Construction and working of S.H.E or N.H.E

On S.H.E both oxidation as well as reduction can takes place

When S.H.E act as Anode, then

When S.H.E act as cathode, then

The electrode potential of S.H.E is taken as zero at 298 K

Measurement of electrode potential using S.H.E

                      Zn half cell

                            S.H.E
  • On left side, oxidation takes place so oxidation potential of

Zn is measured.

Zn → Zn2+ + 2e-
  • On right side, reduction takes place so reduction potential of hydrogen is takes zero (Reference electrode)

2H+ + 2e- → H2 gas
  • Electrode act as anode on which oxidation takes place
  • Electrode acts as cathode on which reduction takes place

 

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