If 1 mole of Ca2+ can displace 2 moles of Na+ in an ion exchange resin, can it do the same for H+? Will Ca2+ ion displace 2 moles of H+ in a strong acid resin?


Yes and no.

Yes, as $\ce{1 Ca^2+}$ displaces $\ce{2 H+}$.

No, as you need to involve more then $\ce{1 Ca^2+}$ to displace $\ce{2 H+}$ for exchange comparable with ionex capacity, as some $\ce{Ca^2+}$ passes through before $\ce{H+}$ is washed out.

  • $\begingroup$ I see. So to completely wash out the H+ ion in the solution, Ca2+ needed to be in excess? Am I right? $\endgroup$ – Kent de los Reyes Jul 30 '19 at 7:12
  • $\begingroup$ Yes, you are. But not in so big excess as opposite, i.e. washing out calcium. Strong catexes prefer calcium to hydrogen, in contrary to weak catexes.. $\endgroup$ – Poutnik Jul 30 '19 at 7:23
  • $\begingroup$ Thank you! This helped me a lot on my exam. $\endgroup$ – Kent de los Reyes Jul 30 '19 at 7:27
  • $\begingroup$ It should not. Using SE to solve exam tasks is a bad way to use it. $\endgroup$ – Poutnik Jul 30 '19 at 7:46
  • $\begingroup$ We have a policy which states that ‎you should show your thoughts, effort and attempts to understand underlaying principles. It'll make us certain that ‎we aren't doing your homework for you, and that the Q/A is beneficial for broad audience. Basically any question with the wording your question has is considered homework; it needn't be literally one. It can be self-study questions, puzzles, worked examples etc. $\endgroup$ – Poutnik Jul 30 '19 at 7:48

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