My book says that Ca2+ and Mg2+ are in a 1:1 molar ratio with EDTA. However, what about compounds like Co and others? When will I know when it isn't a 1:1 ratio?
Answer:
Sure -- it depends on the orbital structure of the metal atom.
EDTA is a chelating agent, and you can have as many as three around certain metals, such as Mn, Cu, Fe, and Co.
See the referenced articles for more.
Ah... No. EDTA is a bi-dentate ligand, but it only binds to a single atom.
The EDTA complexation is just like any other combination reaction. You will have a limiting reagent either the metal ion or the EDTA. So to call for a 1:1 mole ratio isn’t technically correct, since your excess reactant skews the whole 1:1 ratio. In the complex it is 1:1.
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