Question

what is the correct order of equivalent conductance at infinite dilution of LiCl,NaCl and KCL?

Answer 1

the correct order is

KCl > NaCl > LiCl .

explanation:- in case of Alkali metals , hydration energy decreases with increase atomic number e.g., order of hydration energy is

Li+ > Na+ > K+ > Rb+ > Cs+ .

and we know, mobility is inversely proportional to hydration energy so,

order of mobility is

Cs+ > Rb+ > K+ > Na+ > Li+

now, equivalent conductance is directly proportional to mobility .

that's why order of equivalent conductance is

K+ > Na+ > Li+

hence, order of equivalent conductance is

KCl > NaCl > LiCl.