what is concentration cell ? Give an example how is the emf of such a cell a calculated ?
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Concentration cells can be defined as electrochemical cells that consist of two half-cells wherein the electrodes are the same, but they vary in concentration. As the cell as a whole strives to reach equilibrium, the more concentrated half cell is diluted and the half cell of lower concentration has its concentration increased via the transfer of electrons between these two half cells. Therefore, as the cell moves towards chemical equilibrium, a potential difference is created.
The cell potential or EMF of the electrochemical cell can be calculated by taking the values of electrode potentials of the two half – cells. There are usually three methods that can be used for the calculation: By taking into account the oxidation potential of anode and reduction potential of cathode.