Ethylenediaminetetraacetic acid disodium salt, abbreviated as E.D.T.A. disodium salt or simply E.D.T.A. Na2, is a synthetic compound derived from ethylenediamine and formaldehyde. It is a white, crystalline powder that is highly soluble in water. E.D.T.A. disodium salt is a chelating agent, meaning it has a strong affinity for metal ions, and it is widely used in various industrial and scientific applications.

One of the primary functions of E.D.T.A. disodium salt is to chelate or sequester metal ions, effectively preventing them from reacting with other substances and forming unwanted precipitates or deposits. This property makes it valuable in the formulation of cleaning agents, detergents, and soaps, where it helps improve the cleaning efficiency by binding to metal ions present in hard water. In the food industry, E.D.T.A. disodium salt is used as a preservative to maintain the color, flavor, and texture of certain processed foods. It also finds applications in the textile industry for dyeing and bleaching processes, in the pharmaceutical industry for drug formulations, and in water treatment to prevent scale formation in pipelines and boilers. Additionally, E.D.T.A. disodium salt is used in laboratories for various chemical analyses and experiments.