The molarconductivity of KCl soluitons at difference concentrations at 298 K are given below : {:("c/mol"L^(-1) ,^^_(m)//S cm^(2) " mol"^(-1)),(0.000198,148.61),(0.000309,148.29),(0.000521,147.81),(0.000989,147.09):} Show that a plot betweenE_(m) and c^(1//2) isa straightline . Determie the values of E_(m)^(@) and Afor KCl.

The molarconductivity of KCl soluitons at difference concentrations at

1.	The molarconductivity of KCl soluitons at difference concentrations at 298 K are given below : {:("c/mol"L^(-1) ,^^_(m)//S cm^(2) " mol"^(-1)),(0.000198,148.61),(0.000309,148.29),(0.000521,147.81),(0.000989,147.09):} Show that a plot betweenE_(m) and c^(1//2) isa straightline . Determie the values of E_(m)^(@) and Afor KCl.
Answer» Solution :Taking the square root of concentration we obtain: `{:(c^(1//2)"/"(molL^(-1))^(1//2) ,^^_(m)//S cm^(2) " MOL"^(-1)),(0.01407,148.61),(0.01758,148.29),(0.02283,147.81),(0.03145,147.09):}` A plotof `^^_(m)` (y - axis ) and `c^(1//2)` (x-axis ) is shownin (fig 3.7) It can be seen that isnearly a STRAIGHTLINE . From the intercept `(c^(1//2) = 0)` we find that `E_(m)^(@) = 150.0 S cm^(2) mol^(-1)` andA = - Slope `=87.46 S cm^(2) mol^(-1)// (mol//L^(-1))^(1//2)`