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Disodium hydrogen phosphate dihydrate
Disodium hydrogen phosphate dihydrate Chemical Properties
- Melting point:92,5°C
- Density 1.064 g/mL at 20 °C
- vapor density 4.9 (vs air)
- storage temp. Store at +5°C to +30°C.
- solubility H2O: 0.5 M at 20 °C, clear, colorless
- form powder
- color White
- PH8.9-9.2 (25℃, 0.5M in H2O)
- PH Range9.1
- Water Solubility Soluble in water
- λmaxλ: 260 nm Amax: 0.03
λ: 280 nm Amax: 0.03
- Stability:Stable. Incompatible with strong oxidizing agents.
- CAS DataBase Reference10028-24-7(CAS DataBase Reference)
- EPA Substance Registry SystemDisodium phosphate dihydrate (10028-24-7)
Disodium hydrogen phosphate dihydrate Usage And Synthesis
- Chemical Propertiessolid
- Chemical PropertiesThe USP 32 states that dibasic sodium phosphate is dried or
contains, 1, 2, 7, or 12 molecules of water of hydration.
Anhydrous dibasic sodium phosphate occurs as a white powder.
The dihydrate occurs as white or almost white, odorless crystals.
The heptahydrate occurs as colorless crystals or as a white granular or caked salt that effloresces in warm, dry air. The dodecahydrate occurs as strongly efflorescent, colorless or transparent crystals.
- Production MethodsEither bone phosphate (bone ash), obtained by heating bones to
whiteness, or the mineral phosphorite is used as a source of tribasic
calcium phosphate, which is the starting material in the industrial
production of dibasic sodium phosphate.
Tribasic calcium phosphate is finely ground and digested with sulfuric acid. This mixture is then leached with hot water and neutralized with sodium carbonate, and dibasic sodium phosphate is crystallized from the filtrate.
- DefinitionChEBI: A hydrate that is the dihydrate form of disodium hydrogenphosphate
- Pharmaceutical ApplicationsDibasic sodium phosphate is used in a wide variety of pharmaceutical
formulations as a buffering agent and as a sequestering agent.
Therapeutically, dibasic sodium phosphate is used as a mild laxative
and in the treatment of hypophosphatemia.
Dibasic sodium phosphate is also used in food products; for example as an emulsifier in processed cheese.
- SafetyDibasic sodium phosphate is widely used as an excipient in
parenteral, oral, and topical pharmaceutical formulations.
Phosphate occurs extensively in the body and is involved in
many physiological processes since it is the principal anion of
intracellular fluid. Most foods contain adequate amounts of
phosphate, making hypophosphatemia (phosphate deficiency)
virtually unknown except for certain disease states or in patients
receiving total parenteral nutrition. Treatment is usually by the oral
administration of up to 100 mmol of phosphate daily.
Approximately two-thirds of ingested phosphate is absorbed from the gastrointestinal tract, virtually all of it being excreted in the urine, and the remainder is excreted in the feces.
Excessive administration of phosphate, particularly intravenously, rectally, or in patients with renal failure, can cause hyperphosphatemia that may lead to hypocalcemia or other severe electrolyte imbalances. Adverse effects occur less frequently following oral consumption, although phosphates act as mild saline laxatives when administered orally or rectally. Consequently, gastrointestinal disturbances including diarrhea, nausea, and vomiting may occur following the use of dibasic sodium phosphate as an excipient in oral formulations. However, the level of dibasic sodium phosphate used as an excipient in a pharmaceutical formulation is not usually associated with adverse effects.
LD50 (rat, oral): 17 g/kg
- storageThe anhydrous form of dibasic sodium phosphate is hygroscopic.
When heated to 40℃, the dodecahydrate fuses; at 100℃ it loses its
water of crystallization; and at a dull-red heat (about 240℃) it is
converted into the pyrophosphate, Na4P2O7. Aqueous solutions of
dibasic sodium phosphate are stable and may be sterilized by
The bulk material should be stored in an airtight container, in a cool, dry place.
- IncompatibilitiesDibasic sodium phosphate is incompatible with alkaloids, antipyrine, chloral hydrate, lead acetate, pyrogallol, resorcinol and calcium gluconate, and ciprofloxacin. Interaction between calcium and phosphate, leading to the formation of insoluble calcium-phosphate precipitates, is possible in parenteral admixtures.
- Regulatory StatusGRAS listed. Accepted in Europe for use as a food additive. Included in the FDA Inactive Ingredients Database (injections; infusions; nasal, ophthalmic, oral, otic, topical, and vaginal preparations). Included in nonparenteral and parenteral medicines licensed in the UK. Included in the Canadian List of Acceptable Non-medicinal Ingredients.
Disodium hydrogen phosphate dihydrate Preparation Products And Raw materials
- BUFFER SOLUTION PH 4 BUFFER SOLUTION PH 2.8 ACCORDING TO SOERENSEN Potassium phthalate (2:1) BUFFER SOLUTION PH 4.00 BS FORMULATED BUFFER SOLUTION PH 4.00 PHENOLPHTHALEIN DIPHOSPHATE TETRASODIUM SALT D-RIBOFURANOSE-5-PHOSPHORIC ACID SODIUM SALT 3'-GMP DISODIUM SALT UDP SODIUM SALT 2'-Deoxyguanosine-5'-diphosphate trisodium salt Thymidine-5'-monophosphate disodium salt SODIUM GLYCEROPHOSPHATE HYDRATE Sodium tripolyphosphate 2',3'-DIDEOXYGUANOSINE 5'-TRIPHOSPHATE TETRASODIUM SALT THYMOLPHTHALEIN MONOPHOSPHATE DISODIUM SALT INOSINE-5'-TRIPHOSPHORIC ACID, DISODIUM SODIUM PHOSPHOTUNGSTATE Disodium 5'-Inosinate
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