Chpt 21-2 - Cell Potentials 21.3, 21.4 Notation for Voltaic...

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Unformatted text preview: Cell Potentials 21.3, 21.4 Notation for Voltaic Cell First Example: Zn( s ) | Zn 2+ ( aq ) || Cu 2+ ( aq ) | Cu( s ) Indicates the separate solutions Everything to the left is what happens in the anode (Write oxidation reaction from this) Everything to the right is what happens in the cathode (Write reduction reaction from this) Notes: A single vertical line | indicates a change in phase, a comma is used to indicate species in the same phase 21.2 Voltaic cells Active electrodes When the metal in the electrode is identical to that in aqueous solution Anode is being oxidized (anode is consumed) Cathode is reduced (cathode is growing) Inactive electrodes When the metal in the electrode does not match the aqueous solution Electrode does not play a role in the reaction Often used when one of the steps in the cell takes place entirely in solution Inactive electrode Example Anode (-) Platinum Cathode (+) Platinum Salt Bridge H + + MnO 4- Mn 2+ 2 I- I 2 e- e- Platinum does not take place in the reaction Notation for Voltaic Cell Second Example: platinum | I- ( aq ) | I 2...
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Chpt 21-2 - Cell Potentials 21.3, 21.4 Notation for Voltaic...

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