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Voltaic Cell Process
• Now, the cathode’s ion undergoes reduction.
Cu2+ undergoes reduction.
Reduction reaction: Cu2+ + 2e- Cu
The Cu2+ solution turned into Cu.
This means that the Cu2+ solution shrinks and the Cu electrode grows.
• Because the electrons got transferred, the solutions’ charges are not balanced anymore. So, the slat bridge transfers the ions from the solution until the charges are balanced. In “Regents words”, the salt bridge permits the migration of ions, but prevents the solutions from mixing.
The movement of electrons through the wire creates electricity. The reaction can only happen if the switch is closed.
UNIT 10: OXIDATION & REDUCTION © 386
