EDTA is Consider a larger laboratory reagents commonly used in chemistry volumetric analysis why?

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

This complex used in complexmetric analysis because of chelating property towards many metals ex, heavy metals ,alkaline earth metals and transition metals

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