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Pratiksha Gandhi posted an Question
September 20, 2020 • 00:47 am
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30 points
30 points
- IIT JAM
- Chemistry (CY)
How the mobility of ion changes with solvent ?please explain in detail.
how the mobility of ion changes with solvent ?Please explain in detail.
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Priyanshu kumar
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The ionic mobility is strongly affected by the viscosity of the solvent and the degree of solvation. The dissociation constants depend on the dielectric constant of the solvent. Therefore, the use of nonaqueous solvent or the mixed solvent affects the mobility and may improve the separation (the solvent effect).
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Priyanshu kumar Best Answer
Example:- For other ions in polar solvent like water, Cs+>Rb+>K+>Na+>Li+ In water, these ions are surrounded by water molecules because water has a permanent dipole which is attracted towards positive charge of these ions. Li+ has very small size compared to others and hence, its charge to radius ratio is very high. Due to this it attracts more number of water molecules and hence, due to more numbers of water molecules surrounding it, it cannot move easily in water. Hence, it has least ionic mobility. In non-polar solvents, the order is reversed: Cs+