Concentration Cell

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KeiannaPineda1B
Posts: 51
Joined: Mon Jun 17, 2019 7:24 am

Concentration Cell

Postby KeiannaPineda1B » Tue Feb 18, 2020 7:30 pm

What is an example of a concentration cell?

Aman Sankineni 2L
Posts: 103
Joined: Fri Aug 30, 2019 12:17 am

Re: Concentration Cell

Postby Aman Sankineni 2L » Tue Feb 18, 2020 7:31 pm

Concentration cells are of two types:
1. Electrode concentration cells: In these cells, the potential difference is developed between two electrodes at different concentrations dipped in the same solution of the electrolyte. For example, two hydrogen electrodes at different gaseous pressures in the same solution of hydrogen ions constitute a cell of this type.
2. Electrolyte concentration cells: In these cells, electrodes are identical but these are immersed in solutions of the same electrolyte of different concentrations. The source of electrical energy in the cell is the tendency of the electrolyte to diffuse from a solution of higher concentration to that of lower concentration. With the expiry of time, the two concentrations tend to become equal. Thus, at the start the emf of the cell is maximum and it gradually falls to zero.


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