Ion mobility, Chemistry

Assignment Help:

Ion mobility:

Ion mobility is related to molar conductivity by the equations:

723_ion mobolity.png

which allows the mobilities, u+ and u- of the cation and anion to be determined from molar conductivity measurements at and away from infinite dilution. z+ and z- are the formal charges of the cation and anion respectively, so z+F and |z-F| are the magnitudes of the charges on a mole of cations and anions. The mobility is always positive (+) and is a measure of the terminal migration speed of an ion per unit applied electric field. This limiting speed is accelerating due to the field is exactly balanced by the viscous drag of the ions moving through the solution which for a spherical ions lead to the equations:

55_ion mobolity1.png

where e is the charge on the electron (-), so ze is the charge on the ions, η is the viscosity, a constant for any solvents which determines how easy it is for the ion to part the solvent molecule and move through solution and a is the hydrodynamic radius of the solvated ion.

 

H+/OH- mobility:

Hydroxide and Protons ions have anomalously high ionic molar conductivities and mobilities in comparison to all ions, and in particular for their size. That is as a result of the mechanism by which they move through solution, called the Grotthus mechanism (Fig. 1).

 

2320_ion mobolity2.png

Fig. 1. The Grotthus mechanism for (a) H+; (b) OH- ion motion in water. The arrows indicate the concerted proton movement when the field is applied.


Related Discussions:- Ion mobility

Metallurgy, Write down the reactions taking place in different zones in the...

Write down the reactions taking place in different zones in the blast furnace during the extraction of iron.

Effect of oriantation in aromatic ring, what effect of two oriantation gps...

what effect of two oriantation gps in the same aromatic ring?

The de-broglie wavelength associated with material particle, The de-Broglie...

The de-Broglie wavelength associated with a material particle is: (1)  Directly proportional to its energy (2) Directly proportional to momentum (3) Inversely proportiona

Indoctomeric effect, Explain indoctomeric effect with example of nitro comp...

Explain indoctomeric effect with example of nitro compound?

Periodic table, the name of the group of metals that easily loses electrons...

the name of the group of metals that easily loses electrons

Ether., how yield of ether is highest when the halide ion is displased from...

how yield of ether is highest when the halide ion is displased from a primary rather than secondary or tertiary halide?

Salt analysis, SIr Plzz do guide me that why only 7 groups of transition el...

SIr Plzz do guide me that why only 7 groups of transition element are used for salt analysis ? Others are not used for salt analysis...mean other tranistion elements?

Biochemistry, what is alternative form of cholesterol formed in plants and ...

what is alternative form of cholesterol formed in plants and prokaryotes ?

Example on crystal field splitting in octahedral complexes, Q. Example on C...

Q. Example on Crystal field splitting in octahedral complexes? Here four ligands lie in one plane and the other two in a plane perpendicular to the first plane. Six ligands are

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