Chapter 17: Electrochemistry

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

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.

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

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.

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.