First slide

Conductivity , Molar conductivity and Equivalent Conductivity

Question

Calculate the molar conductivity of 0.2 mol L^-1 KCl solution.

Moderate

A

$124 \times 10^{- 2} {Sm}^{2} {mol}^{- 1}$
B

$124 \times 10^{- 3} S m^{2} {mol}^{- 1}$
C

$124 \times 10^{- 4} S m^{2} {mol}^{- 1}$
D

$124 \times 10^{- 5} S m^{2} {mol}^{- 1}$

Solution

$\begin{array}{l} Concentration = 0 .2 mol L^{- 1} \\ = 1000 \times 0 .2 mol m^{- 3} = 200 mol m^{- 3} \end{array}$
$\begin{array}{l} Molar conductivity = Λ_{m} = \frac{κ}{C} \\ = \frac{248 \times 10^{- 3} {Sm}^{- 1}}{200 {molm}^{- 3}} \\ = 124 \times 10^{- 5} {Sm}^{2} {mol}^{- 1} \end{array}$

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