First slide

Electrochemical cells

Question

Which ions has exceptionally higher $λ^{\infty}$ values ?

Moderate

A

$H^{+}$
B

$K^{+}$
C

${OH}^{-}$
D

${NH}_{2}^{-}$

Solution

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 $H_{2} O$ can be explained by Grouttus type meachanism in which a proton moves rapidly from $H_{3} O^{+}$ 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, $O H^{-}$ has the highest ionic mobility.

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