1. Chapter 17: Electrochemistry
2/24/2019
Copyright © 2008 Pearson Prentice Hall, Inc.
Copyright © 2008 Pearson Prentice Hall, Inc.

2. 17.12 Electrolysis and Electrolytic Cells
Chapter 17: Electrochemistry
2/24/2019
17.12 Electrolysis and Electrolytic Cells
Electrolysis: The process of using an electric current to bring about chemical change.
Process occurring in galvanic cell and electrolytic cells are the reverse of each other
In an electrolytic cell, two inert electrodes are dipped into an aqueous solution
Copyright © 2008 Pearson Prentice Hall, Inc.
Copyright © 2008 Pearson Prentice Hall, Inc.

3. 17.12 Electrolysis and Electrolytic Cells
Anode: where oxidation takes place
Anions are oxidized at this electrode
labeled positive to reflect anions attraction to anode
Cathode: where reduction takes places
Cations are reduced at this electrode
Labeled negative to reflect the cations attraction to cathode

5. Electrolysis and Electrolytic Cells
Chapter 17: Electrochemistry
2/24/2019
Electrolysis and Electrolytic Cells
Electrolysis of Molten Sodium Chloride
Anode:
Cl2(g) + 2e-
2Cl1-(l)
Cathode:
2Na(l)
2Na1+(l) + 2e-
Overall:
2Na(l) + Cl2(g)
2Na1+(l) + 2Cl1-(l)
Copyright © 2008 Pearson Prentice Hall, Inc.

6. Electrolysis and Electrolytic Cells
Chapter 17: Electrochemistry
2/24/2019
Electrolysis and Electrolytic Cells
Electrolysis of Aqueous Sodium Chloride
Anode:
Cl2(g) + 2e-
2Cl1-(aq)
Cathode:
H2(g) + 2OH1-(aq)
2H2O(l) + 2e-
Overall:
Cl2(g) + H2(g) + 2OH1-(aq)
2Cl1-(l) + 2H2O(l)
Copyright © 2008 Pearson Prentice Hall, Inc.
Copyright © 2008 Pearson Prentice Hall, Inc.