I know the normal way to do it is with complexometric titrations but can someone give me information about the one that am I asking?
Than you!
You could use a solution of one metal at known assay and make a titration.
Acid base is possible theoretically but EDTA has 4 acid and 2 basic groups so difficult to arrange.
It may be useful for somebody so I am going to self answer:
Is possible and easy if a defined EDTA salt (i.e. the disodium salt) is reacted with a calcium chloride excess to 'liberate the protons':
H2Y2- + Ca2+ -> CaY2- + 2H+, so the resulting solution can be titrated as an strong acid.
It does not have in account that Ca2+ has a little acid behavior since it can be complexed by OH- ions, and eventually other species of EDTA can be present in the reagent (the ones having one or three protons available to liberate)
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