alleryEthylenediaminetetraacetate (EDTA⁴⁻) is what type of ligand?
AUnidentate
BDidentate
CAmbidentate
DHexadentate (binds through 2 N + 4 O atoms)
Answer & Solution
Correct answer: D. Hexadentate (binds through 2 N + 4 O atoms)
**EDTA⁴⁻** is a classic **hexadentate** chelating ligand — binds the metal through **2 nitrogen and 4 carboxylate-oxygen donor atoms**, forming 5 chelate rings.
Used to titrate Ca²⁺/Mg²⁺ for water-hardness estimation.
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