Disodium Phosphate (DSP), also known as Dibasic Sodium Phosphate, is a highly soluble inorganic compound with the chemical formula Na₂HPO₄. Understanding its physical and chemical properties is crucial for its effective use and safe handling in various industrial and commercial applications. NINGBO INNO PHARMCHEM CO.,LTD., a prominent supplier of chemical raw materials, provides insights into the dynamics of DSP (CAS 7558-79-4).

DSP exists in several hydrated forms, the most common being the dihydrate (Na₂HPO₄·2H₂O), the heptahydrate (Na₂HPO₄·7H₂O), and the anhydrous form (Na₂HPO₄). The anhydrous form has a melting point of approximately 243-245 °C, while its density is around 2.066 g/mL. A key characteristic of DSP is its tendency to weather in the air. At normal temperatures, it can readily lose water of crystallization, typically converting to the heptahydrate form, which loses about five molecules of water. This hygroscopic nature necessitates careful storage conditions.

In terms of solubility, Disodium Phosphate is highly soluble in water. A 0.5 M solution at 20 °C is clear and colorless. Notably, its aqueous solutions exhibit a slightly alkaline reaction, with a pH typically between 8.8 and 9.2 for a 1% solution. This alkalinity is fundamental to its use as a buffering agent in many applications, from food processing to pharmaceutical formulations.

Further thermal decomposition of DSP occurs at higher temperatures. When heated to 250 °C, it decomposes into sodium pyrophosphate (Na₄P₂O₇). This reactivity profile is important for formulators to consider when developing products that may undergo heat treatments. For a reliable supply of quality Dibasic Sodium Phosphate, sourcing from experienced manufacturers like NINGBO INNO PHARMCHEM CO.,LTD. is recommended.

Proper handling and storage are essential for maintaining the integrity of Disodium Phosphate. It should be stored in tightly sealed containers in a cool, dry place, away from incompatible materials, to prevent weathering and contamination. For industrial buyers, understanding these chemical dynamics ensures optimal product performance and longevity. If you are looking to purchase DSP and require detailed technical data, NINGBO INNO PHARMCHEM CO.,LTD. is your trusted China-based supplier, ready to provide the necessary information and support.