Question

Why molar conductivity of weak electrolytes cannot be calculated from extrapolation method?

Answer 1

Ostwald's law of dilution, which gives the dissociation constant of a weak electrolyte as a function of concentration, can be written in terms of molar conductivity. Thus, the pKavalues of acids can be calculated by measuring the molar conductivity and extrapolating to zero concentration. Namely, pKa = p(K/(1 mol dm−3)) at the zero-concentration limit, where K is the dissociation constant from Ostwald's law.

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