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EDTA Di Sodium
Ethylenediaminetetraacetic acid, widely abbreviated as EDTA, is a polyamino
carboxylic acid and a colourless, water-soluble solid. Its conjugate base is named ethylenediaminetetraacetate.
It is widely used to dissolve limescale. Its usefulness arises because of its role as a hexadentate ("six-toothed") 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. EDTA is produced as several
salts, notably disodium EDTA and calcium disodium EDTA.