What is strong electrolyte ? Explain relation between molar conductivity and concentration of solution with strong electrolyte.

Explanation

* (a) Strong electrolyte : Electrolytes which gives maximum ionization in its aqueous solution are known as strong electrolyte.
* Conductivity of solution having strong electrolyte is more. For e.g. KCl, NaCl, `KNO_(3), NaNO_(3),MgCl_(2),CaCl_(2),MgSO_(4)` etc. Salts of strong acid and base are strong electrolyte.
* (b) Concentration of solution and value of `Lamda_(m)`: for strong electrolytes, `Lamda_(m)` increases slowly with dilution and can be represented by the equation.
`Lamda_(m)=Lamda_(m)^(@)-A c^(1//2)`
Where, `Lamda_(m)=`molar conductivity of strong electrolyte.
`Lamda_(m)^(@)`=limiting molar conductivity of strong electrolyte.
`Lamda_(m)^(@)`=limiting molar conductivity of strong electrolyte.
c=molar conductivity of solution in mol `L^(-1)`

* Where, A=constant=negative slope of graph.

* Value of A depends on : (i) type of electrolyte
(+ve and -ve ions) like 1-1, 1-1, 2-1, 2-2
etc. (ii) temperature and (iii) pressure.
* Value of `Lamda_(m)` is same for same type of all electrolyte.