CAS 7558-79-4

Synonym: SODIUM PHOSPHATE, DIBASIC ANHYDROUS, TECHNICAL;SODIUM PHOSPHATE, DIBASIC BIO-REFINED;Sodiumhydrogenphosphate,99+%(ACS);buffer solution from di-sodium hydrogen phosphate;sodium hydrogen phosphate, anhydrous, acs;sodium phosphate dibasic solution;DIBASICSODIUMPHOSPHATE,DRIED,USP;SODIUMPHOSPHATE,DIBASIC,ANHYDROUS,BIOTECHGRADE

MF: HNa2O4P

MW: 141.96

Product Categpry: NULL;metal phosphate compound;Chemistry;Inorganics;Food Additives

Melting Point: 243-245 °C

Density: 1.064 g/mL at 20 °C

Vapour Density: 4.9 (vs air)

FEMA: 2398 | DISODIUM PHOSPHATE

Storage Temp.: Store at RT.

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

Form: powder

Color: White

PH: 8.9-9.2 (25℃, 50g/L in water)

pKa: (1) 2.15, (2) 6.82, (3) 12.38 (at 25℃)

Water Solubility: >=10 g/100 mL at 20 ºC

λmax: λ: 260 nm Amax: 0.019

λ: 280 nm Amax: 0.016

Sensitive: Hygroscopic

Merck: 14,8659

Stability: Stable. Incompatible with strong acids. Hygroscopic.

InChlKey: BNIILDVGGAEEIG-UHFFFAOYSA-L

Hazard Codes: Xi

Risk Statements: 36/37/38

Sfaety Statements: 26-36-24/25

RIDADR: UN 3077 9 / PGIII

WGK Germany: 3

RTECS: WC4500000

F: 3

TSCA: Yes

Toxicity: LD50 orally in Rabbit: > 2000 mg/kg

Description: Sodium phosphate dibasic is highly hygroscopic and water soluble. Useful in conjunction with Sodium Phosphate, Monobasic in the preparation of biological buffers. It is commonly used in biological assay buffers. Sodium is required for nerve and muscle functioning. Sodium Phosphate Dibasic can be used as a dietary supplement and as a nutrient. Sodium hydrogen phosphate is used in food and water treatment in conjunction with trisodium phosphate.In foods, it is used to adjust pH. In water treatment, It retards calcium scale formation. It is also found in some detergents and cleaning agents. This product is known to be Used in many applications including the purification of antibodies. It is used as a saline laxative to treat constipation or to clean the bowel before a colonoscopy.

Chemical Property: The anhydrous compound is white crystalline powder; hygroscopic; density 1.70 g/cm3; converts to sodium pyrophosphate at 240°C; soluble in water; 874 SODIUM PHOSPHATE, DIBASIC insoluble in alcohol. The dihydrate is a crystalline powder or granular solid; density 2.066 g/cm3 at 15°C; loses water of crystallization at 92.5°C. The heptahydrate is a powdered or granular crystalline solid; density 1.679 g/cm3; loses five molecules of water at 48°C. The dodecahydrate is made up of translucent crystals or granules; density 1.524 g/cm3; readily loses five water molecules on exposure to air at ambient temperature; melts at 35°C when the salt contains all water of crystallization; loses all water at 100°C. All the hydrates are soluble in water and insoluble in alcohol.

Chemical Property: Sodium hydrogen phosphate,NaH2P04·H20, is hygroscopic, transparent, water-soluble crystals. Used as a purgative, reagent,and buffer.

Chemical Property: Disodium phosphate is anhydrous or contains two molecules of water of hydration

Physical Property: The anhydrous compound is white crystalline powder; hygroscopic; density 1.70 g/cm³; converts to sodium pyrophosphate at 240°C; soluble in water;insoluble in alcohol.

The dihydrate is a crystalline powder or granular solid; density 2.066 g/cm³ at 15°C; loses water of crystallization at 92.5°C.
The heptahydrate is a powdered or granular crystalline solid; density 1.679 g/cm³; loses five molecules of water at 48°C.
The dodecahydrate is made up of translucent crystals or granules; density 1.524 g/cm³; readily loses five water molecules on exposure to air at ambient temperature; melts at 35°C when the salt contains all water of crystallization; loses all water at 100°C.
All the hydrates are soluble in water and insoluble in alcohol.

Occurrence: Disodium phosphate is anhydrous or contains two molecules of water of hydration

Uses: Sodium Phosphate, Dibasic is used as a laboratory reagent and a buffer in chemical analysis. Other uses are in manufacturing ceramics, detergents, and enamels; as a mordant in dyeing; for fireproofing paper and wood; for weighting and printing silk; in the treatment of boiler water; as a sequestrant in food; as a dietary supplement; in soldering enamels; and in fertilizers. It is used therapeutically as a cathartic.

Uses: It is used in pH buffer solutions.