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because of its role as a hexadentate ligand and chelating agent, i.e., its ability to "sequester" metal ions such as Ca2+ and Fe3+. After being bound by EDTA, metal ions remain in solution but exhibit diminished reactivity.
because it is good ligand that can make a chelate coordination compound
To diminish the reactivity of any metal ion that may be present in your solution.
Because EDTA any ligand multi indentation For this reason, it has the ability to interact with several elements at the same time