Explain concentration cells with examples., Chemistry

Assignment Help:

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.


Related Discussions:- Explain concentration cells with examples.

Define standard feat of formation, The quantity of heat liberated of absorb...

The quantity of heat liberated of absorbed when one mole of compound is formed in its standard state from its elements in their standard state is known as standard heat of formatio

What is the extent of h-bonding in hf, Since fluorine is very electronegati...

Since fluorine is very electronegative as a result hydrogen develop a very positive character. As a result the H-bonding is very tough because of large difference in electronega

Describe actinoids and its properties., The series of elements involving th...

The series of elements involving the filling of 5f-orbitals is called actinoids series. They follow Ac (89) and include the fourteen elements from Th (90) and Lw (103). The chem

How to find hybridisation, how to find hybridisation?i want shortcut or any...

how to find hybridisation?i want shortcut or any trick

Formaldehyde, formaldehyde 10 N preparation?

formaldehyde 10 N preparation?

Classification of polymers - on the basis of structure, Classification of p...

Classification of polymers - On the basis of structure On the basis of structure of polymers these can be classified as (i) Linear polymers      (ii) Branched chain polym

Explain an lewis acid-base, An Lewis acid-base dissociation of the bromide-...

An Lewis acid-base dissociation of the bromide-essentially an SN1 reaction-gives an a-hydroxy carbo-cation, which is, by resonance, also the conjugate acid of acetophenone. Deproto

Please Help!, 2. A mixture is prepared by adding 25.0 mL of 0.185 M Na3PO4 ...

2. A mixture is prepared by adding 25.0 mL of 0.185 M Na3PO4 to 34.0 mL of 0.140 M Ca(NO3)2. (a) What mass of Ca3(PO4)2 will be formed? (b) What will be the concentrations of eac

Atomic absorption troublshouting, Dear sir, We need your consultancy in a t...

Dear sir, We need your consultancy in a technical problem that we are confronting, and we would really appreciate your help We are in the process of implementing the heavy metal an

Uses of proteins - biomolecules, Uses of Proteins (a) Proteins constitu...

Uses of Proteins (a) Proteins constitute as necessary part of our food. Meat, eggs, fish, cheese offer proteins to human beings. (b) In textile: Casein (a milk protein) is u

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd