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
What is Banana bond? Diborane contains how many banana bonds Ans) In Diborane B-H-B, bridge, which is produced by the sharing of two electrons, is known as banana bond or Tau bo

chemical equation of K2CO3+CH#CH@OH+I2

How is harvest maturity identified? Before harvesting, the first thing to be looked into is the identification of harvest maturity. We have already seen what the term ac


What are trihydric alcohols? What are their preparation methods? What are their physical properties?

A hydrocarbon is burnt completely in excess oxygen.it is found that 5.0g of the hydrocarbon gives 14.6g carbon dioxide and 9.0g of water.knowing that relative molecular mass of the

Q. What is chlorophyll? A magnesium complex of porphyrin is called chlotophyll. the green colouring material in plants and which is essential  for photosynthesis. Hemoglobin

hardness of borewell water is less than that of seawater

what are the main water pollutants

Why rate of reaction in zero order is independent of concentration? Solution) Where r is the reaction rate and k is the reaction rate coefficient with units of time / concentrat