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The membrane keeps the chlorine gas awayfrom the sodium hydroxide solution.
It allows ions through but not molecules
During electrolysis;
i) at the positive terminal: Oxidation is electron loss
2Cl- - 2e- Cl2 Chloride ions form Chlorine molecules by depositing electrons at the positive anode
ii) at the negative terminal: Reduction is electron gain
2H+ + 2e- 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 ! )
CO2 + C CO
During electrolysis;
i) at the positive terminal: Oxidation is electron loss
2Cl- - 2e- Cl2 Chloride ions form Chlorine molecules by depositing electrons at the positive anode
ii) at the negative terminal: Reduction is electron gain
2H+ + 2e- 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 ! )
CO2 + C CO
During electrolysis;
i) at the positive terminal: Oxidation is electron loss
2Cl- - 2e- Cl2 Chloride ions form Chlorine molecules by depositing electrons at the positive anode
ii) at the negative terminal: Reduction is electron gain
2H+ + 2e- 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 ! )
CO2 + C CO
Ions present: Na+, Cl- from sodium chloride H+ , OH- from water
Ions remaining: Na+ (aq) OH- (aq)
Ions present: Na+, Cl- from sodium chloride H+ , OH- from water
Ions remaining: Na+ (aq) OH- (aq)
c hs h s
c h
NaOH + H2 + Cl222 2
Sodium metal at cathode
Chlorine gas at anode