EDTA Is a Hexadentate Ligand Containing Four Carboxylic Acid Groups

question 1

Multiple Choice

EDTA is a hexadentate ligand containing four carboxylic acid groups and two amines.Which is true for the acid-base properties of EDTA?
I EDTA is a hexaprotic system,H₆Y²⁺,when the amines are protonated.
II Neutral EDTA,H₄Y,is tetraprotic when the amines are not protonated.
III Deprotonated EDTA,Y⁴⁻,is the only form of EDTA that binds to metal cations.
IV The fraction of EDTA in any of the six EDTA species is pH dependent.

• A)III and IV
• B)I and II
• C)I,III,and IV
• D)II,III,and IV
• E)I,II,and IV

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