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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    $\begingroup$ We can, but the problem is usually the other way around. Specifically, KCl of various molarity is used as conductivity standard to calibrate conductometers. $\endgroup$
    – Poutnik
    Aug 28 at 15:43
  • $\begingroup$ 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. $\endgroup$ Aug 29 at 21:13
  • $\begingroup$ No, you can add molar conductivities of ions only in a dilute regime. This is also known as Kohlrausch's law of independent migration. $\endgroup$
    – Domen
    Aug 30 at 15:52


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