Concentration Cells

Concentration Cells

 

(or concentration circuits), a type of galvanic element. A distinction is made between concentration cells with and without ion transfer.

Concentration cells with ion transfer are produced by the immersion of two identical electrodes (for example, silver electrodes) in a tank divided by a semipermeable partition and containing the same electrolytic solution (for example, silver nitrate) on both sides of the partition, but in different concentrations. In such concentration cells the electromotive force (emf) arises as a result of direct transfer of the electrolyte from the more concentrated solution to the less concentrated solution. In concentration cells of the second type the concentration of the electrolyte is equalized as a result of chemical processes taking place on two dissimilar electrodes. An example of a concentration cell without ion transfer is a cell with platinum and silver electrodes immersed in a hydrochloric acid solution. For the same ratio of electrolyte concentration the emf of a concentration cell without ion transfer is twice that of a cell with ion transfer. Concentration cells are used in measuring activity coefficients and transference numbers.

REFERENCE

Skorchelletti, V. Teoreticheskaia elektrokhimiia, 3rd ed. Leningrad, 1969.
References in periodicals archive ?
These are 2 kinds of concentration cells. The first is called a salt concentration cell.
According to Revie and Uhlig [4] a more important another kind of concentration cell is the differential aeration cell.
At this concentration cells became round in shape and also did not stain red with neutral red.
At 0.08 ug/ml concentration cells started becoming round in shape and at 0.1 ug/ml there was clear change in morphology of cells as well as complete deterioration in cells shape (Figure 1) There was also great reduction in the number of cells with increased concentration of chromium (Figure 2).
Author Zito (educator and electrical energy professional) provides a way to make energy portable from non-portable sources and gives engineers practical methods for storing energy and using it at a later time, and covers concentration cells and the potential for using them for grid-scale storage, as well as alternatives to current technologies used for large-scale storage.
There are many innocent people who continue to languish in the concentration cells, he deplored and appealed to the UN Secretary General Ban-ki-Moon to take immediate steps to end human rights violations in occupied Kashmir.
They are also known for creating oxygen concentration cells. Another class of micro-organism, known as anaerobic bacteria, can become active in the absence of oxygen.
These promote corrosion by creating oxygen concentration cells.
At 10 g/ml concentration cells were totally round and they also didn't uptake neutral red and they were appearing transparent in color instead of red (Fig.

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