Suppose we have specific conductivities of $\pu{0.1 M}$ $\ce{K+}$ and $\pu{0.1 M}$ $\ce{Cl-}$. Can we add their specific conductivities to get specific conductivity of $\pu{0.1 M}$ $\ce{KCl}$?
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1We can, but the problem is usually the other way around. Specifically, KCl of various molarity is used as conductivity standard to calibrate conductometers. – Poutnik Aug 28 '23 at 15:43
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Conductivity is not necessarily a linear function, particularly at high concentrations. See https://chemistry.stackexchange.com/questions/26781/conductivity-as-a-function-of-acid-concentration For example, there's a reduction at high NaCl concentrations, though KCl is more linear over that range. – DrMoishe Pippik Aug 29 '23 at 21:13
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No, you can add molar conductivities of ions only in a dilute regime. This is also known as Kohlrausch's law of independent migration. – Domen Aug 30 '23 at 15:52