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Electrochemical cells

Which ions has exceptionally higher λ values ?


The hydrogen ion, because of its small size has high charge density and is heavily hydrated. Thus, we expect the mobility of H+ ion to be low rather than high.
The high mobility of H+ ions is hydroxlytic solvents such as H2O can be explained by Grouttus type meachanism in which a proton moves rapidly from H3O+ to a hydrogen-bonded water molecule and is transferred along a series of hydrogen bonded water molecules by a rearrangement of hydrogen bonds (just like a relay race).
Amongest negatives ions, OH- has the highest ionic mobility.

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