EDTA Disodium Salt Dihydrate (CAS 6381-92-6) is a chemical compound widely recognized for its powerful chelating abilities. To utilize this substance effectively and safely, it is crucial to understand its fundamental chemical properties, physical characteristics, and appropriate handling procedures. This detailed examination aims to provide a comprehensive overview for chemists, researchers, and industrial professionals.

Chemically, EDTA Disodium Salt Dihydrate is the disodium salt of ethylenediaminetetraacetic acid. Its molecular formula is C₁₀H₁₄N₂Na₂O₈•2H₂O, and it has a molecular weight of approximately 372.24 g/mol. The molecule features four carboxyl groups and two amino groups, which together form stable coordination complexes with a wide range of metal ions. The presence of sodium ions enhances its solubility in water compared to the free acid form of EDTA.

Physically, EDTA Disodium Salt Dihydrate typically appears as a white crystalline powder. This solid form is convenient for storage, transport, and accurate weighing in laboratory and industrial settings. A key characteristic contributing to its widespread use is its excellent solubility in water; it readily dissolves to form clear, colorless solutions, making it easy to incorporate into aqueous formulations. Its solubility also ensures that the chelating action can occur efficiently in solution-based applications.

The reactivity of EDTA Disodium Salt Dihydrate is primarily defined by its chelating ability. It can form strong, stable complexes with polyvalent metal cations such as Ca²⁺, Mg²⁺, Fe²⁺, Cu²⁺, and Zn²⁺. This property makes it highly effective in applications where controlling the concentration of free metal ions is necessary. For instance, it can inhibit enzymes that require metal ions for activity or prevent metal-catalyzed degradation of other compounds. Its reactivity is generally stable under neutral to slightly alkaline conditions, though it can dissociate in strongly acidic environments.

When handling EDTA Disodium Salt Dihydrate, standard laboratory safety practices should be observed. While it is not typically classified as highly hazardous, it is advisable to avoid inhalation of dust and contact with skin and eyes. Personal protective equipment, such as gloves and safety glasses, is recommended. Storage should be in a cool, dry place, in tightly sealed containers, to maintain its quality and prevent moisture absorption, which could lead to caking.

For those looking to buy EDTA Disodium Salt Dihydrate, understanding the purity specifications is important. Products are often available with purities of 99% or higher, suitable for demanding analytical and industrial applications. Consulting the Material Safety Data Sheet (MSDS) provided by the supplier is crucial for detailed safety and handling information, including any specific precautions related to its chemical properties and potential interactions.

In summary, EDTA Disodium Salt Dihydrate is a chemically versatile and physically convenient compound. Its robust chelating power, coupled with its solubility and stability, makes it an invaluable tool across scientific and industrial domains. Proper understanding of its EDTA disodium salt chemical properties and adherence to safe handling practices ensure its effective and responsible use.