Practice question
Question
A conductivity cell with cell constant 0.4 cm⁻¹ shows a resistance of 250 Ω with a 0.02 M NaCl solution. What is the molar conductivity?
Explanation
kappa = (cell constant/R) = (0.4/250) = 0.0016 S cm⁻¹ . Lambdam = (kappa × 1000/c) = (0.0016 × 1000/0.02) = 80 S cm² mol⁻¹ .