Define interfacial potential differences - galvanic cell, Chemistry

Assignment Help:

Define Interfacial potential differences?

What is the source of an open-circuit, zero-current cell potential? When no electric current passes through the cell, the electric potential must be uniform within each bulk phase that is an electrical conductor, because otherwise there would be a spontaneous movement of charged particles (electrons or ions) through the phase. Electric potential differences in a cell without current therefore exist only at phase boundaries. The equilibrium cell potential is the cumulative result of these potential differences at interfaces between different conducting phases within the cell. An interfacial potential difference appears as a vertical step in a profile of the Galvani potential, as shown schematically in Fig.(a). The zero-current cell potential, Ecell, eq, is the algebraic sum of the interfacial potential differences within the cell.

 

1940_Measuring the equilibrium cell potential.png

When an external resistor is connected to the terminals to form a circuit, current passes through the cell and the cell performs electrical work on the surroundings. Figure (b) shows what happens to the potential profile in this case: the interfacial potential differences are still present within the cell, and the internal resistance of the electrical conductors causes Ecell to be reduced in magnitude compared to Ecell, eq. We shall next look briefly at the origin and consequences of potential differences at interfaces between (1) two different metals, (2) a metal and an electrolyte solution, and (3) two different electrolyte solutions. Keep in mind that these potential differences are theoretical concepts whose values cannot be measured experimentally.


Related Discussions:- Define interfacial potential differences - galvanic cell

Liquid propellants - monopropellants and bipropellants, Liquid propellants ...

Liquid propellants - Monopropellants and Bipropellants These contain an oxidizer like liquid oxygen, nitrogen tetroxide (N 2 O 2 ) or nitric acid and a fuel for example alcohol

The velocity of hydrogen molecule, If the velocity of hydrogen molecule is ...

If the velocity of hydrogen molecule is 5x 10 4 cm sec -1   then its de-Broglie wavelength is: (1) 2 Å    (2) 4 Å    (3) 8 Å    (4)100 Å Ans:  4 Å

1-methylcyclohexene, 1-methylcyclohexene Because 1-methylcyclohexene ha...

1-methylcyclohexene Because 1-methylcyclohexene has dissimilar numbers of alkyl branches at the carbons of its double bond, it gives dissimilar products in the two reactions.

Irreversible reaction, why equilibrium state attainable from either way?

why equilibrium state attainable from either way?

Organic chemistry, synthesis of di and tri substituted benzenes(symmetrical...

synthesis of di and tri substituted benzenes(symmetrical tribromo benzene, 2-amino-5methylphenol, 3-nitro-4-bromobenzoic acid, 3,4-dibromonitrobenzene, 1,2,3-trimethyl benzene) sta

Draw a two-dimensional model of a closed-packed assembly, Draw a two-dimens...

Draw a two-dimensional model of a closed-packed assembly of spheres. Change this model into a three-dimensional one. How many dissimilar possibilities are there of stacking a)

Explain classification of arches, Explain classification of arches accordin...

Explain classification of arches according to shapes raw a neat sketch of Flemish bond (1 brick wall and 1.5 brick wall thickness ).

Show reduction to metals, Q. Show Reduction to Metals? After removed of...

Q. Show Reduction to Metals? After removed of the gangue, i.e. impurities physically mixed with the metal elements, the concentrated ore becomes ready for the isolation of meta

Nitro compound ., what the uses of nitro compound in pharmacy

what the uses of nitro compound in pharmacy

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