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What is the difference between activation polarization and concentration polarization?
Wiki User
∙ 16y ago
Activation polarization refers to a condition when the reaction rate (of oxidation or reduction) is controlled by the slowest "step" in a series of reaction steps. For example, in hydrogen reduction reaction, the first step (1) may be when hydrogen ions absorbed from solution onto the anode surface, (2) then electron transfer occurs from anode to the hydrogen ions to form hydrogen, (3) then the hydrogen elements form hydrogen gas molecules, (4) which then form hydrogen gas bubbles. The slowest of these 4 steps, dictates how fast the overall reduction reaction happens.
Concentration polarization refers to a condition of the limits of diffusion. Basically, again referring to the hydrogen reduction reaction, the concentration of H+ ions around the cathode affects the reaction rate. It could be that the concentration is too high (there is plently of H+ ions around, or the concentration is too low (not enough H+ ions around or the reduction reaction is 'eating them up' too quickly).
Wiki User
∙ 16y ago
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What are the similarities between concentration polarization and kinetic polarization?
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What is concentration polarization cross flow filtration?
Convective and back-diffusive flow of solvent can cause a build-up of dissolved solutes and macromolecules near and on the surface of the membrane this is known as concentration polarization. When concentration polarization occurs there is a differential solute concentration between the membrane surface and the bulk of the feed stream. The osmotic pressure in the polarized layer due to the high local solute concentration lowers the transmembrane pressure therefore decreasing flux. In cross -flow filtration there is a general decline in flux over time of operation this is due to concentration polarization. The decline in flux can be restored with the manipulation of the operating parameters.
What forms a concentration whenever there is a difference in concentration between one place and another?
A concentration gradient forms when there is a difference in concentration between one place and another.
Is there any difference between polarisation and polarization?
Only the spelling, they are two spellings for the same thing.
What is concentration polarization in membrane science?
Many electrochemical reactions produce or consume species in the solution. The rates of reactions involving dissolved species which participate as reactants in the rate-determining step(that stage in the reaction which controls its rate) will be dependent on the concentration of the dissolved species. As the dissolved species are consumed by the reaction, so a greater change in potential will be required to maintain the current, and this is known as concentration polarization. A reaction for which concentration polarization dominates is referred to as mass-transport or diffusion controlled.
What is the difference between electrical polarisation and dielectric polarisation?
in electric polarization ion is formed which have more tendency to form then magnetic polarization . in magnetic polarization just transfer of electron via flux . so the basic reason is that ion has more mobility constant then electron.so electric polarization is more faster then magnetic polarization.
What is the difference between esf 15 and external affairs?
Answer is: Designation or activation
What kind of concentration forms whenever there is a difference in concentration between one place and another?
noThe correct answer if you are dealing with cells is concentration gradient
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Concentration Gradient
What is the difference in concentration between a region of high concentration and one of lower concentration?
There is no exact number assigned to the difference between the higher and lower concentrations. However, the establishment of a concentration differential is essential for both diffusion as well as osmosis.
What is the the difference between the salt concentration of hot water and the salt concentration of cold water?
The same
What is the difference between concentrated and concentration?
the difference between concentrated and dilute is concentrated is larger while dilute is smaller.
