Electrolysis of Aqueous NaOH

Anode : Eo = -0.40 V

4 OH- ? O2(g) + 2 H2O + 2e-

Cathode : Eo = -0.83 V

4 H2O + 4e- ? 2 H2 + 4 OH-

Eo for cell = -1.23 V

since Eo < 0 , ?Go > 0

- not spontaneous !

- ONLY occurs if Eexternal > 1.23 V is applied

file://C:\chem_eve\11_electrolysis.mov

21m10vd1.mov

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