EDTA Titrations
EDTA Titrations
We already used metal complexation in Week 2 for the Fe Colorimetry Experiment:
Fe2+ + 3 Fz2- => Fe(Fz)34-
Chem M3LC R. Corn
Ferrozine (Fz2-) is a metal ligand
Three Ferrozine will form a metal-ligand complex with Fe2+
Metal Complex Formation Constants
Weak Metal Complex Formation Constants have similar values of K1 to Kn
Therefore, many species co-exist in solution!
EDTA Metal Ion Complexation Equilibria Ethylene Diamine Tetra-acetic Acid (H4Y)
EDTA - the world's best metal ion chelator
Y4-
"Chelate"
Y4-
pH
Most EDTA titrations are performed at pH >= 10.
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