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Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: fredodgers on October 24, 2014, 11:17:20 PM

Title: Ion Exchange Column Question
Post by: fredodgers on October 24, 2014, 11:17:20 PM

Hello,

I have a quick question regarding elution when it comes to an anion exchange column.  In a lab I was doing, both 9M and 4M HCl were used to elute Ni in the form NiCl⁺ and Co in the form CoCl⁺ respectively.  My question is whether or not something like KCl could be used instead of this HCl for the purposes of elution (would the KCl be able to provide the necessary source of chloride, in essence)? 
Any help would be appreciated!

Title: Re: Ion Exchange Column Question
Post by: Borek on October 25, 2014, 03:06:27 AM

If it is the anion exchange column it was H⁺, not K⁺, that is important for the exchange. Cl^- complexes the metal cation, but it is not that important effect.

Title: Re: Ion Exchange Column Question
Post by: fredodgers on October 25, 2014, 10:28:14 AM

Quote from: Borek on October 25, 2014, 03:06:27 AM

If it is the anion exchange column it was H⁺, not K⁺, that is important for the exchange. Cl^- complexes the metal cation, but it is not that important effect.

Would K⁺ be able to play the role of the H⁺?  What factors would I have to think about to determine this?

Title: Re: Ion Exchange Column Question
Post by: Borek on October 25, 2014, 12:20:58 PM

Quote from: fredodgers on October 25, 2014, 10:28:14 AM

Would K⁺ be able to play the role of the H⁺?

To some extent for sure.

I have never used an anion exchange resins, but I am quite sure what you ask is just a part of the resin characteristics - either listed by the seller, or easy to measure experimentally on your own.