Explain concentration cells with examples., Chemistry

The galvanic cells in which electrodes are made of same metal but they are immersed in the electrolytes of different concentrations in two half cells are called concentration cells. The difference in the concentrations of electrolytes in the two half cells, creates potential difference across the two electrodes. The electrode which is placed in electrolyte of larger concentration acts as cathode or + terminal. Whereas electrode which is placed in electrolyte of lower concentration acts as anode or -ve terminal.

The cell can be represented as Cu/CuSO4 (0.01 M) ? CuSO4 (1 M)/Cu or simply as Cu/Cu2+ (0.01 M) ? Cu2+ (1 M)/Cu.

Similarly, hydrogen ion concentration cell can be constituted by connecting hydrogen electrodes placed in hydrochloric acid solutions of different concentration. It can be represented as
Pt, H2 (1 bar)/H+ (0.01 M) ? H+ (1 M)/H2 (1 bar), Pt.

Ecell of concentration cell

Consider the consideration cell of the type M/Mn+ (C1) ? Mn+(C2)/M. since standard electrode potentials of the two electrodes cancel each other, the emf of the cell can be written on the basis of Nerst equation as
Ecell = (0.059/n) log C2/C1

Evidently, for Ecell to be positive C2 > C1.

Posted Date: 6/25/2012 8:49:25 AM | Location : United States

Related Discussions:- Explain concentration cells with examples., Assignment Help, Ask Question on Explain concentration cells with examples., Get Answer, Expert's Help, Explain concentration cells with examples. Discussions

Write discussion on Explain concentration cells with examples.
Your posts are moderated
Related Questions
how is ores extracted and the down stream process and its principles?

What types of detergent remove oils and fats

thermodynamics help to be a good chemist

explain colloidal in a huge way with example and diagram

what is the colour of the residue for nickel in charcoal cavity test

hardness of borewell water is less than that of seawater

Q. Complexation Behaviour of the f-block? Ions of actinide and lanthanide elements have a strong tendency to form complexes with a variety of oxygen and nitrogen donor ligands.

Q. Study of Elements of group 16? We shall discuss Group 16 elements, viz., oxygen, sulphur, selenium, tellurium and polonium. These elements are called chalcogens or the ore f

After making an ester by heating a carboxylic acid with alcohol in the presence of concentrated sulfuric acid, water is added to the mixture and the ester seperates out as oily lay