Product Description:
Disodium hydrogenorthophosphate (CAS 7558-79-4), commonly known as disodium phosphate (DSP) or sodium phosphate dibasic, is an inorganic salt of phosphoric acid. It appears as a white, odorless, crystalline powder or granules and is highly soluble in water, forming an alkaline solution. This compound is extensively used as a food additive, buffering agent, emulsifier, sequestrant, and pH regulator in various industrial, pharmaceutical, and laboratory applications.
Product Properties:
Property Value CAS Number 7558-79-4 Molecular Formula Na₂HPO₄ (anhydrous), Na₂HPO₄·2H₂O (dihydrate), Na₂HPO₄·7H₂O (heptahydrate), Na₂HPO₄·12H₂O (dodecahydrate) Molecular Weight 141.96 g/mol (anhydrous) Appearance White crystalline powder or granules Solubility Highly soluble in water, insoluble in alcohol pH (1% solution) Approximately 8.7 – 9.3 Forms Available Anhydrous, Dihydrate, Heptahydrate, Dodecahydrate Synonyms Disodium phosphate, DSP, Sodium phosphate dibasic, Secondary sodium phosphate, Disodium hydrogen phosphate Product Usage:
Disodium hydrogenorthophosphate has a wide range of applications. In the food industry, it functions as a pH adjuster, stabilizer in dairy products (e.g., processed cheese, evaporated milk), and an emulsifier. Pharmaceutical applications include its use as a buffering agent in ophthalmic solutions and parenteral preparations, as an excipient, and as a component in saline laxatives. Industrially, it is used in water treatment to control corrosion and scale, as a buffering agent in textile dyeing and printing, and in the manufacture of ceramics and detergents. In laboratories, it is a common component of phosphate buffer solutions.
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