Practice question
Question
A conductivity cell with a 0.015 M KNO₃ solution has a resistance of 300 Ω and a cell constant of 0.75 cm⁻¹. What is the molar conductivity?
Explanation
kappa = (cell constant/R) = (0.75/300) = 0.0025 S cm⁻¹ . Lambdam = (kappa × 1000/c) = (0.0025 × 1000/0.015) = 166.67 S cm² mol⁻¹ .
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