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Chemistry · L4 · EDTA's six donor atoms wrapping a single metal ion

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The chelate effect: EDTA's two amine nitrogens and four carboxylate oxygens all coordinate simultaneously to one central metal ion, forming a single, extremely stable 1:1 complex.

by @openstemUpdated Chemistry
EDTA molecule(hexadentate ligand)Amine N donor atom #1Amine N donor atom #2Carboxylate O donor atom #1Carboxylate O donor atom #2Carboxylate O donor atom #3Carboxylate O donor atom #4Central metal ion Mⁿ⁺(e.g. Ca²⁺, Mg²⁺, Pb²⁺)1:1 chelate complexmetal ion almost fully enclosedhuge formation constant Kf

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