Briefly explain the extraction by chelation. Also give some examples of the chelating agents used.

Extraction by chelation is a technique used in analytical chemistry to selectively separate and concentrate certain metal ions from a mixture by forming stable complexes with chelating agents. Chelating agents are organic compounds that possess multiple donor atoms capable of coordinating with metal ions, forming a ring-like structure called a chelate. This chelate is more stable than __________ _________ ________ ____ __________ _________ _________.
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