IB Chemistry Power Points                             Topic 09                       Electrolytic Cells SLwww.pedagogics.ca
Electrolytic Cellsan electric current is used to drive a non-spontaneous redox reaction                  This process is c...
Electric current enters and exits the cell by electrodesElectrolytic cells often use inert electrodes (electrodes thatdon’...
Cathode is the                                        negative terminal of                                        the powe...
Predicting electrolysis productsMolten Salt ElectrolytesREQUIRES – molten salt and inert electrodesALWAYS – metal cation r...
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2012 topic 09 electrolytic cells sl

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2012 topic 09 electrolytic cells sl

  1. 1. IB Chemistry Power Points Topic 09 Electrolytic Cells SLwww.pedagogics.ca
  2. 2. Electrolytic Cellsan electric current is used to drive a non-spontaneous redox reaction This process is called electrolysis
  3. 3. Electric current enters and exits the cell by electrodesElectrolytic cells often use inert electrodes (electrodes thatdon’t react).Like voltaic cells:1. Cathode: - electrode at which reduction occurs2. Anode: - electrode at which oxidation occurs Unlike voltaic cells: cathode is (-) & anode is (+) Electrodes are immersed in a common electrolyte.
  4. 4. Cathode is the negative terminal of the power supply This is the site of reduction of +ive ions in electrolyte Negative ions are oxidized at the anode.Electrolytic cells are used for extraction, refining,electroplating, commercial manufacture of gases, etc.
  5. 5. Predicting electrolysis productsMolten Salt ElectrolytesREQUIRES – molten salt and inert electrodesALWAYS – metal cation reduced at cathode, nonmetal anionoxidized at anode.Write the cathode, anode and overall rxns for this example Pb2+ (l) + 2e-  Pb (l) 2Br- (l)  Br2 (g) + 2e- Pb2+ (l) + 2Br- (l)  Pb (l) + Br2 (g)
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