First slide

Conductivity , Molar conductivity and Equivalent Conductivity

Question

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

Moderate

A

$0 .248 S {cm}^{- 1}$
B

$0 .248 S m^{- 1}$
C

$2 .48 S {cm}^{- 1}$
D

$2.48 S m^{- 1}$

Solution

The cell constant is given by the equation:
Cell constant,
$\begin{array}{l} G^{} = conductivity \times resistance \\ = 1 .29 S / m \times 100 Ω \\ = 129 m^{- 1} = 1 .29 {cm}^{- 1} \end{array}$
Conductivity of 0.2 mol L^-1 KCI solution
$\begin{array}{l} cell constant/ resistance \\ = \frac{G^{}}{R} = \frac{129 m^{- 1}}{520 Ω} = 0 .248 {Sm}^{- 1} \end{array}$

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