Potassium chloride has a greater ionic radius than sodium chloride. How does this affect the fall in rate of increase in conductivity as concentration concentrations? I know the following factors affect the plateauing of the curve:

lesser dissociation, the equilibrium is disturbed as a result of lack of water molecules to fully solvate the ions, ionic pair association and the increased visocity of the solution

In my experiment I found that the decraase of the rate of increase was greater for KCl, which I found weird.

  • $\begingroup$ Ionic radius is not the same as the effective hydrated ionic radius. Their orders for Li Na K are mutually reversed. $\endgroup$ – Poutnik Nov 28 '20 at 0:09
  • $\begingroup$ It rather affect ion mobility and therefore molar conductivity. Smaller ions have stronger field and therefore thicker effective AVG layer of attached water molecules bound to it and following its electromigration. $\endgroup$ – Poutnik Nov 28 '20 at 0:21
  • $\begingroup$ Molar conductivity is better parameter than conductivity. $\Lambda = \kappa/c$ BTW I was addressing differences between ions, not concentration effect . $\endgroup$ – Poutnik Nov 28 '20 at 0:26
  • $\begingroup$ Let us continue this discussion in chat. $\endgroup$ – Poutnik Nov 28 '20 at 0:30
  • $\begingroup$ @Strawhat It would be nice if you could stop vandalizing your own posts. $\endgroup$ – andselisk Nov 28 '20 at 8:43

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