Can Anion Resins Effectively Separate Cations Like Co(II) and Ni(II)?

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Anion resins can effectively separate cations like Co(II) and Ni(II) through a process involving complexation rather than traditional ion exchange. While cation exchange resins typically attract cations due to their negatively charged groups, anion resins can facilitate separation by binding anions that form complexes with the cations. This allows for selective retention of specific cations based on their affinity for the anionic groups in the resin. The confusion arises from the terminology, as anion resins are designed to interact with anions, but their use in complexometric methods allows for the separation of cations through indirect means. Understanding the chemistry of complexation is key to grasping how anion resins can be utilized in this context.
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Homework Statement


I am doing a lab called "Complexometric Determination of Cobalt"

and am asked "Explain why an anion resin can be used to separate a mixture of cations such as Co(II) and Ni(II)"


I have no idea. My textbook says that cation exchange resins are used to separate cations. So part of me wants to say that you can't use an anion resin...but our lab uses an anion resin to separate them so it has to be able to.


I can't find any resources that explain how an anion resin could be used to separate cations.
I would think an anion resin wouldn't be able to attract cations at all since it is made up of positively charged groups on the stationary phase, which would repel the cations.

So confused.



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The Attempt at a Solution

 
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Do you know step by step procedure for your lab?
 
Is it terminology? - that cation exchange resins are anionic, i.e. their covalently attached groups are anions? :confused:
 
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