Question

The formula used to calculate molar conductivity of an electrolyte is _______.

• A. $\Lambda = \frac{1000c}{k}$
• B. $c = \frac{1000\Lambda}{k}$
• C. $\Lambda = \frac{1000k}{c}$
• D. $k = \frac{1000}{\Lambda c}$

Answer 1

Answer: (C)

$\Lambda = \frac{1000k}{c}$

Answer 2

Molar conductivity ($\Lambda$) is the conductivity of the volume of solution containing one mole of electrolyte. If $k$ is specific conductivity (S cm⁻¹) and $c$ is molar concentration (mol L⁻¹), then the volume containing one mole of electrolyte is $1000/c$ cm³. Therefore, $\Lambda = k \times (1000/c) = 1000k/c$.