The sequence of ionic mobility in aqueous sol | vedclass

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(D) In an aqueous solution,ions are hydrated. The smaller the size of the bare ion,the greater is the degree of hydration because the charge density i

Vedclass · Accepted Answer

$Cs^{+} > Rb^{+} > K^{+} > Na^{+}$

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(D) In an aqueous solution,ions are hydrated. The smaller the size of the bare ion,the greater is the degree of hydration because the charge density is higher. Thus,the degree of hydration is highest for $Li^{+}$ and lowest for $Cs^{+}$. Due to a larger hydration shell,the hydrated ion size becomes larger for ions with smaller bare radii. Consequently,$Cs^{+}$ has the smallest hydrated size and $Li^{+}$ has the largest hydrated size. Since ionic mobility is inversely proportional to the size of the hydrated ion,the mobility is highest for $Cs^{+}$ and lowest for $Li^{+}$. The correct order of ionic mobility in aqueous solution is $Cs^{+} > Rb^{+} > K^{+} > Na^{+} > Li^{+}$.

The sequence of ionic mobility in aqueous solution is

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