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For weak electrolytes, why is $\Lambda_0$ determined indirectly (via Kohlrausch's law from strong electrolyte data) rather than by extrapolation?
AWeak electrolytes have no $\Lambda_0$
BWeak electrolytes don't dissociate at all
C$\Lambda$ vs $\sqrt c$ is not linear for weak electrolytes, so extrapolation is unreliable
DStrong electrolytes are easier to handle
Answer & Solution
Correct answer: C. $\Lambda$ vs $\sqrt c$ is not linear for weak electrolytes, so extrapolation is unreliable
For weak electrolytes, dissociation increases steeply on dilution and $\Lambda$ vs $\sqrt c$ is curved (not linear) — extrapolation to infinite dilution is unreliable. Kohlrausch's additivity rule provides a workaround using strong electrolytes whose $\Lambda_0$ can be obtained by extrapolation.
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