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The membrane keeps the chlorine gas away
from the sodium hydroxide solution. It allows ions through but not molecules
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i) at the positive terminal: Oxidation is electron loss 2Cl- - 2e- Cl2
During electrolysis; i) at the positive terminal: Oxidation is electron loss 2Cl e Cl2 Chloride ions form Chlorine molecules by depositing electrons at the positive anode ii) at the negative terminal: Reduction is electron gain 2H e H2 hydrogen ions form hydrogen molecules by receiving electrons from the negative cathode A reaction where both reduction and oxidation occurs is called a ‘Redox’ reaction. ( OIL RIG ! ) CO C CO
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i) at the positive terminal: Oxidation is electron loss 2Cl- - 2e- Cl2
During electrolysis; i) at the positive terminal: Oxidation is electron loss 2Cl e Cl2 Chloride ions form Chlorine molecules by depositing electrons at the positive anode ii) at the negative terminal: Reduction is electron gain 2H e H2 hydrogen ions form hydrogen molecules by receiving electrons from the negative cathode A reaction where both reduction and oxidation occurs is called a ‘Redox’ reaction. ( OIL RIG ! ) CO C CO
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i) at the positive terminal: Oxidation is electron loss 2Cl- - 2e- Cl2
During electrolysis; i) at the positive terminal: Oxidation is electron loss 2Cl e Cl2 Chloride ions form Chlorine molecules by depositing electrons at the positive anode ii) at the negative terminal: Reduction is electron gain 2H e H2 hydrogen ions form hydrogen molecules by receiving electrons from the negative cathode A reaction where both reduction and oxidation occurs is called a ‘Redox’ reaction. ( OIL RIG ! ) CO C CO
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Ions remaining: Na+ (aq) OH- (aq) Ions present:
Na+, Cl from sodium chloride H+ , OH- from water Ions remaining: Na+ (aq) OH- (aq)
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Ions remaining: Na+ (aq) OH- (aq) Ions present:
Na+, Cl from sodium chloride H+ , OH- from water Ions remaining: Na+ (aq) OH- (aq)
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c h s h s c h 2 2 2 NaOH + H2 + Cl2 Sodium metal at cathode
Chlorine gas at anode
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