Question

Which will have greater molar conductivity?
1 mol of LiCl in 500 cc or 1 mol of KCl in 500 cc.
[Please give reason also]

Answer 1

KCl (Potassium Chloride) will have higher molar conductivity that LiCl (Lithium Chloride) because of the following reasons:

• If we compare the size of the cation we will get : ${Li}^{+1}<{K}^{+1}$

• Now, if we compare the charge on the cations we will see that both are uni-positive charge (+1).

• So, Lithium ion has higher charge : size ratio.

• Hence in aqueous solution, Li+1 gets extensively surrounded by Water (H2O) molecules. This is called Hydration.

• Due to extensive hydration , the Li+1 ion cannot move freely in the solution. Hence, the movement of the charge carrier is decreased.

• But Potassium ion with lesser hydration moves freely.

• So, KCl has higher conductivity that LiCl.

Hope It Helps.

Answer 2

Explanation:

KCl (Potassium Chloride) will have higher molar conductivity that LiCl (Lithium Chloride) because of the following reasons:

If we compare the size of the cation we will get : {Li}^{+1}<{K}^{+1}Li

+1

<K

+1

Now, if we compare the charge on the cations we will see that both are uni-positive charge (+1).

So, Lithium ion has higher charge : size ratio.

Hence in aqueous solution, Li+1 gets extensively surrounded by Water (H2O) molecules. This is called Hydration.

Due to extensive hydration , the Li+1 ion cannot move freely in the solution. Hence, the movement of the charge carrier is decreased.

But Potassium ion with lesser hydration moves freely.

So, KCl has higher conductivity that LiCl.

Hope It Helps.