The molar conductivity of `KCl` solution at different concentrations at `298 K` is given below `:`
`{:(c or M (mol L^(-1)),wedge_(m)(Scm^(2)mol^(-1))),(0.000198,148.61),(0.000309,148.29),(0.000521,147.81),(0.000989,147.09):}`
Show that a plot between `wedge_(m)` and `sqrt(c)` is a straight line. Determine the value of `wedge_(m)^(@)` and `A` for `KCl` .

Explanation

To solve the problem, we need to show that a plot between the molar conductivity (λ_m) and the square root of concentration (√c) is a straight line, and then determine the values of λ_m0 and A for KCl.

### Step-by-Step Solution:

1. **Calculate the Square Root of Concentration (√c)**:
- Given concentrations (c in mol/L):
- 0.000198
- 0.000309
...