The membrane keeps the chlorine gas away from the sodium hydroxide solution.

27. The membrane keeps the chlorine gas away from the sodium hydroxide solution. It allows ions through but not molecules

28. During electrolysis; i) at the positive terminal: Oxidationis electronloss 2Cl- - 2e- Cl2 Chloride ions form Chlorine molecules by depositing electrons at the positive anode ii) at the negative terminal: Reductionis electrongain 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

29. During electrolysis; i) at the positive terminal: Oxidationis electronloss 2Cl- - 2e- Cl2 Chloride ions form Chlorine molecules by depositing electrons at the positive anode ii) at the negative terminal: Reductionis electrongain 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

30. During electrolysis; i) at the positive terminal: Oxidationis electronloss 2Cl- - 2e- Cl2 Chloride ions form Chlorine molecules by depositing electrons at the positive anode ii) at the negative terminal: Reductionis electrongain 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

31. Ions present: Na+, Cl-from sodium chloride H+ , OH-fromwater Ions remaining: Na+ (aq) OH- (aq)

32. Ions present: Na+, Cl-from sodium chloride H+ , OH-fromwater Ions remaining: Na+ (aq) OH- (aq)

34. c h s h s c h 2 NaOH + H2 + Cl2 2 2 Sodium metal at cathode Chlorine gas at anode