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

Photon absorption for ir spectroscopy, Photon absorption for IR spectroscop...

Photon absorption for IR spectroscopy                                                                  Photon absorption for IR spectroscopy

Draw a possible configuration of nodes and cells , Consider the 2D shape be...

Consider the 2D shape below. Draw a possible configuration of nodes and cells (at least 15) that could be used to solve for the temperature distribution. Provide equations that wou

The wave number associated with this light, The frequency of a wave of ligh...

The frequency of a wave of light is 12x 10 14 s -1 .   The wave number associated with this light is: (1) 5x10 -7 m                        (2)  4x 10 -8 cm -1

Dipole moment - applications of hyperconjugation, Dipole Moment - Applicati...

Dipole Moment - Applications of Hyperconjugation As hyperconjugation affects the development of charges, it as well affects the dipole moment in the molecule. The increase in d

Lab prepation, How is ethane gas is preparec in the lab?

How is ethane gas is preparec in the lab?

F-Block, why is the f-block grouped in the way it is

why is the f-block grouped in the way it is

#titlespontaneous and non spontaneous reactions, give me assigment of spont...

give me assigment of spontaneous and non spontaneous reactions

Gibb''''s free energy change, What is basically Gibb''s free energy change?...

What is basically Gibb''s free energy change?Why it is required and How is related to spontaneity of a chemical reaction ?  Ans) The energy associated with a chemical reaction t

What is galvanic cell, A Galvanic cell or voltaic cell or electrochemical c...

A Galvanic cell or voltaic cell or electrochemical cell is a system in which a spontaneous chemical oxidation- reduction happens and makes electrical energy.

Combustion analysis, When 3.896 grams of a hydrocarbon, CxHy, were burned i...

When 3.896 grams of a hydrocarbon, CxHy, were burned in a combustion analysis apparatus, 11.40 grams of CO2 and 7.003 grams of H2O were produced. In a separate experiment, the mo

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