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

Salt, what is the name of the precipitate and the formulae of the precipita...

what is the name of the precipitate and the formulae of the precipitate of NH3 (aq) and Pb(NO3)2 (aq)

The numbers of electrons with the azimuthal quantum numbers, Consider the g...

Consider the ground state of(Z= 24)  . The numbers of electrons with the azimuthal quantum numbers,l=1   and 2 are, respectively: (1) 16 and 4          (2) 12 and 5

Explain peroxide-promoted addition, Explain Peroxide-promoted addition ...

Explain Peroxide-promoted addition Peroxide-promoted addition is in competition with normal addition and rearrangement. The normal processes happen at the same rate at which t

Explain hybrid rocket propellants, Explain the following and give one examp...

Explain the following and give one example of each: a. Tranquillizers b. Mordant c. Hybrid rocket propellants

Periodic table, what are the properties of d-block elements?

what are the properties of d-block elements?

The electronic configuration of gadolinium (atomic no. 64), The electronic ...

The electronic configuration of gadolinium (atomic no. 64) is: (1)  [Xe]4s 8 5d 9 6s 2                           (2) [Xe] 4s 1 5d 1 6s 2             (3) [Xe]4s 3 5d

The azimuthal quantum number has a value, When the azimuthal quantum number...

When the azimuthal quantum number has a value of l= l , the shape of the orbital is : (1) Unsymmetrical (2) Spherically symmetrical (3) Dumb-bell (4)Complicated Ans:

Tie line, tie line explain in with the help of phase rule

tie line explain in with the help of phase rule

Mole concept, 0.45 g of anhydrous oxalic acid is reacted with 50 ml of KMNO...

0.45 g of anhydrous oxalic acid is reacted with 50 ml of KMNO4 . Then normality of KMnO4 is??

Electron, Ask quThe maximum number of electrons which each sub-shell can oc...

Ask quThe maximum number of electrons which each sub-shell can occupy is 2(2l+1)

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