Chapter 121 of 2363 min read

Conductance and Kohlrausch's law

Why this is asked: A weak electrolyte's molar conductivity shoots up sharply on extreme dilution and its plot doesn't extrapolate to a finite value the way a strong electrolyte's does — which is exactly why the weak electrolyte's limiting molar conductivity is obtained indirectly, via Kohlrausch's law of independent migration of ions, never by extrapolating its own graph.

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Test yourself

•If the molar conductivity ( $Λ_{m}$ ) of a $0.050 mol L^{- 1}$ solution of a monobasic weak acid is $90 S c m^{2} mo l^{- 1}$ , its extent (degree) of dissociation will be [assume $λ_{+}^{\circ} = 349.6 S c m^{2} mo l^{- 1}$ and $λ_{-}^{\circ} = 50.4 S c m^{2} mo l^{- 1}$ ]:

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