Energy Released from Redox Reaction can be used to do work
In a spontaneous oxidation-reduction (redox) reactions, electrons are transferred and energy is released.

Voltaic Cell

We can use the energy to do work if we make electrons flow through an external device.
Anode Half-Cell
The electrode at which oxidation occurs at.
  • As electrons leave the anode, the cations formed dissolve into the solution in the anode compartment.
  • Cathode Half-Cell
    The electrode at which reduction occurs at.
  • As electrons reach the cathode, cations are attracted to the now negative cathode.
  • The electrons are taken by the cation and the neutral metal is deposited on the cathode
  • Two Half-Cells
    Flow of electrons
    ------------------------>
    Salt Bridge
  • For a voltaic cell to work, the two half-cells must remain electrically neutral.
  • To keep charges balanced, a salt bridge contains a salt solution with cations and anions that move toward the cathode and anode respectively as the electrons move from the anode to the cathode.
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