19.5b Concentration Cells | General Chemistry

Chad provides a succinct lesson on Concentration Cells, galvanic cells that use the same electrode as the anode and the cathode, though with differing concentrations of aqueous species in solution. Having the same electrode for the anode and cathode means that the standard cell potential for a concentration cell is always zero. But they are never run at standard conditions. They are run under nonstandard conditions, and the larger the difference in concentrations between the two half-cells the larger the cell potential which is calculated using the Nernst equation. As a concentration cell is discharged, the difference in concentration between the two half cells decreases. If a concentration cell is discharged until the concentrations in each half-cell are equal, the cell potential would be zero as calculated by the Nernst equation.

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00:00 Lesson Introduction
00:27 Introduction to Concentration Cells
03:56 How to Calculate Ecell for Concentration Cells

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