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
Q. Explain Organic Chemistry and it's compound? Fossil fuels are made of organic compounds. The proteins, carbohydrates and fats in our bodies are also organic compounds. Many

Q. What do you mean by Nuclear Fusion? Ans. The idea of fusion is that two small unstable nuclei are smooshed together to make one larger stable nucleus. This is the type

solubility of s-block elements to flame test


why the hydroxides of alkaline earth metals are less basic than alkali metals of the corresponding periods?

For the n= 2  energy level, how many orbitals of all kinds are possible: (1) 2        (2) 3        (3) 4        (4) 5 Ans: 4

Number of orbitats in h sub-shell is: (1) 11              (2) 15       (3) 17            (4) 19 Ans: 11



Stability of gem diols lies on the following factors: (a) Steric hindrance by +I group around α-carbon decreases the stability of gem diols. +I group decreases stability of gem