21.3 Electrochemical Cells (Video)
- Page ID
- 342621
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Video Topics
To investigate electrode potentials, we create an electro-chemical cell. Galvanic cells: Electrochemical cells that produce electrical current. Each 1/2 reaction in a redox reaction is used to create a 1/2 cell.
There are 2 Kinds of interactions:
1) Metal ions gain electrons to become solid metal on the electrode. This is the reduction 1/2 reaction.
2) The metal on the surface of the electrode loses electrons and enters solution to become an ion. This is the oxidation 1/2 reaction.
Electrons are generated at the anode and are pushed to the cathode. For the two 1/2 cell reactions to occur, the electrodes must be connected by a wire to allow for electron flow. A voltmeter can be used instead of a wire to measure the electron flow. To compensate for the movement of electrons there must be a corresponding flow of ions. For this to occur the two 1/2 cells are connected by a salt bridge. A salt bridge is usually a gel which contains an ionic species such KNO3. Once all of the parts are connected there is the possibility for electron flow. The difference in the electrode potentials between the anode and the cathode 1/2 reactions is called the cell voltage. It can also be called the cell potential or the electromotive force (emf), and is represented by the symbol Ecell.
Link to Video
Electrochemical Cells: https://youtu.be/nyS1BQ2ZVIg
