Phosphoric acid, sodium salt (1:2), CAS No. 7558-79-4

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7558-79-4

Catalog No. EBD2197772

CAS 7558-79-4

Name Phosphoric acid, sodium salt (1:2)

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Basic Information

Synonyms: di-SodiumhydrogenphosphateanhydrousPhEur,BP,USP sodiumhydrogenphosphate Disodiumhydrogenphosphate Sodiumphosphate,dibasic Disodiumhydrogenphosphate,edible disodiumorthophosphate di-sodiumhydrogenorthophosphate di-SodiumHydrogenphosphate DisodiumMonohydrogenOrthophoshate disodiummonohydrogenphosphate DisodiumMonophosphate disodiumphosphoricacid Phosphoricacid,disodiumsalt Sodiumacidphosphate dibasicsodiumphosphate Sodiummonohydrogenphosphate sodiummonohydrogenphosphate(2:1:1) SodiumPhosphateDibasic SODIUMPHOSPHATEREAGENTGRADEDIBASIC sodaphosphate DisodiumPhosphate Di-SodiumPhosphate SodiumPhosphate,DibasicAnhydrous phosphoricacid,sodiumsalt(1:2) Disodiumhydrogenphosphateanhydrous DisodiumHydrogenorthophosphate di-Sodiumhydrogenphosphateanhydrous

Molecular Formula: HNa2O4P

Molecular Weight: 141.96

MDL Number: MFCD00003496

Categories: Synthetic Chemistry > Basic Synthetic Reagents > Inorganic Compounds and Metal Salts

Product Description:

Disodium hydrogen phosphate is an inorganic salt with the formula Na_HPO_. It exists as an anhydrous form, as well as dihydrate and dodecahydrate crystals. It is a white, odorless powder that is highly soluble in water, forming an alkaline solution. Its primary application is as a food additive (E339ii), where it functions as an acidity regulator, emulsifier, and sequestrant. It is commonly used in processed cheese, dairy products, and baking powders to control pH and improve texture. In industrial settings, it serves as a buffering agent in water treatment to prevent corrosion and scale formation, and as a cleaning agent in detergents. It is also utilized in the textile industry for dyeing and as a fire retardant. Additionally, disodium hydrogen phosphate is a key component in biological buffers, such as phosphate-buffered saline (PBS), for maintaining a stable pH in biochemical research. It is generally recognized as safe (GRAS) when used in accordance with food regulations.

Physical Properties

Melting Point: 243-245 °C

Density: 1.064 g/mL at 20 °C

Solubility: H2O: 0.5 M at 20 °C, clear, colorless

Storage: Store at RT.

Safety Information

Packing Level: III

Hazard Category: 9

Transport Codes: 3082

Analytical Data

Appearance: white granular powder