First slide

Conductivity , Molar conductivity and Equivalent Conductivity

Question

0.05M NaOH solution offered a resistance of 31.6 $Ω$ in a conductivity cell at 298K. If the cell constant of the conductivity cell is 0.367cm^–1, the molar conductivity of the NaOH solution is

Moderate

A

232 $Ω$ ^–1cm²mol^–1
B

214 $Ω$ ^–1cm²mol^–1
C

241 $Ω$ ^–1cm²mol^–1
D

220 $Ω$ ^–1cm²mol^–1

Solution

$λ_{m} = κ \times \frac{1000}{M} = \frac{1}{R} \times \frac{l}{a} \times \frac{1000}{M}$
$λ_{m} = \frac{1}{31.6} \times 0.367 \times \frac{1000}{0.05} ≅ 232 Ω^{- 1} {cm}^{2} {mol}^{- 1}$

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