Standard Cell Potential

[Ryan Aung 2I]

Why is the standard cell potential of a concentration cell always equal to 0?

[Reet Padda 1C]

In a concentration cell, the two concentrations of the solutions are the same because the same solution is on both sides of the porous disk, and as such, both sides contain cations AND anions. Therefore, there is no electron flow between the sides because the concentrations of cations and anions are the same. When the cell potential is then measured at standard conditions, the E^o_cell is going to be equal to zero because of the lack of electron movement.

[Dylan Do]

Because adding the standard cell potentials for anodes and cathodes equal to zero.

[Daniella Viorato 2G]

It is good to know the SCP for anodes and cathodes cancel each other out, making the SCP 0.

[Christopher Lai 2I]

The standard cell potential can be described via the equation E0cell = E0cathode - E0anode. Since both half cells have the same electrode, the potential of the cathode and anode will have the same magnitude but opposite signs. As a result, the net potential difference between the two half-cells will be zero, thus, the standard cell potential will be zero.