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

Mg+ configuration, 1s 2 , 2s 2 , 2p 6 3s 1 shows configuration of: (1...

1s 2 , 2s 2 , 2p 6 3s 1 shows configuration of: (1) Al 3+   in ground state (2) Ne in excited state  (3) Mg + in excited state   (4) None of these Ans:  Mg + in

Awart sarni, plese give me awart sarni upto 200 nos

plese give me awart sarni upto 200 nos

Define atomic mass units, Q. Define atomic mass units? Atomic mass Scie...

Q. Define atomic mass units? Atomic mass Scientists have set up a standard for the measurement of atomic mass by assigning the carbon-12 atom a mass of 12 atomic mass units (a

Freezing Point Lowering, The freezing point of ethylene glycol is -3.2 degr...

The freezing point of ethylene glycol is -3.2 degree-Celcius. How many grams of ethylene glycol is required in 150 L of water to achieve such temperature?

Anomalous behaviour of boron, why boron have maximum covalency 4 and others...

why boron have maximum covalency 4 and others have maximum covalency 6

Evolution of the modern atomic model, Q. Evolution of the Modern Atomic Mod...

Q. Evolution of the Modern Atomic Model? Ans: The atomic models of Dalton, Thomson, Rutherford, and Bohr eventually evolved into the current-day Quantum Mechanical model of the

Polyhydroxy butyrate or phb, Polyhydroxy butyrate (PHB) Polyhydroxy but...

Polyhydroxy butyrate (PHB) Polyhydroxy butyrate or PHB is acquired from hydroxy butyric acid (3-hydroxy butanoic acid)

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