Electrolysis of Water





Electrolysis of Water

To electrolyze water, a dilute aqueous NaOH solution is used as an electrolyte and a carbon or platinum rod is used as an electrode. When water is electrolyzed, hydrogen gas is generated at the (-)pole and oxygen gas is generated at the (+)pole. The reaction formula at the each electrode can be expressed as follows.

(+)pole: 2OH- → H2O + 1/2 O2 + 2e
(-)pole: 2H2O + 2e → H2 + 2OH-

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