CBSE Class 10 Answered
i am not able to understand electrolysis of water
Asked by subramanya.chm | 18 May, 2023, 03:44: PM
Expert Answer
Dear Student,
The chemical reaction of passing an electric current through water to decompose hydrogen and oxygen gases is known as the electrolysis of water.
The reaction is as follows:
2H2O ↔ 2H2↑ + O2↑
The number of hydrogen molecules produced is double that of oxygen molecules.Hydrogen is collected at the negative anode after water electrolysis, while oxygen is collected at the positive anode.
Electrolysis of acidified water
Electrolyte: Acidified water
Anode: Platinum
Cathode: Platinum
Ionisation of acidified water:
H2O → H+ + OH–
H2SO4 → H+ + SO42–
Ions present: H+, SO42–, OH–
Reaction at the cathode:
H+ + e− → H
H + H → H2 (hydrogen molecule)
Reaction at the anode:
OH– − e−→ OH × 4
OH– ion discharge in preference to SO42–
4OH → 2H2O + O2 (oxygen molecule)
Answered by | 20 May, 2023, 10:36: AM
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