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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1$\begingroup$ We can, but the problem is usually the other way around. Specifically, KCl of various molarity is used as conductivity standard to calibrate conductometers. $\endgroup$– PoutnikCommented Aug 28, 2023 at 15:43
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$\begingroup$ Conductivity is not necessarily a linear function, particularly at high concentrations. See chemistry.stackexchange.com/questions/26781/… For example, there's a reduction at high NaCl concentrations, though KCl is more linear over that range. $\endgroup$– DrMoishe PippikCommented Aug 29, 2023 at 21:13
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$\begingroup$ No, you can add molar conductivities of ions only in a dilute regime. This is also known as Kohlrausch's law of independent migration. $\endgroup$– DomenCommented Aug 30, 2023 at 15:52
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