十二水磷酸二钠

Description

Disodium phosphate dodecahydrate · CAS 10039-32-4 · Na2HPO4. UNII 22ADO53M6F. Solubility: 11.8 g/100 g water at 25 °C; Density: 0.5-1.2 g/cm³; Decomposition: ~250 °C.

Identification

CAS Registry Number	10039-32-4
PubChem CID	24203
Molecular formula	Na2HPO4
IUPAC name	disodium;hydrogen phosphate
UNII (FDA)	22ADO53M6F
FEMA number	2398

Computed Descriptors

Molecular Weight	141.959
Hydrogen Bond Donor Count	1
Hydrogen Bond Acceptor Count	4
Rotatable Bond Count	0
Exact Mass	141.94078407
Monoisotopic Mass	141.94078407
Topological Polar Surface Area	83.4
Heavy Atom Count	7
Formal Charge	0
Complexity	46.5

Physical & Chemical Properties

Solubility	11.8 g/100 g water at 25 °C
Density	0.5-1.2 g/cm³
Decomposition	~250 °C
pH	pH = 9.1 for 1% aq soln at 25 °C

Physical description & handling notes

• Sodium phosphate, dibasic appears as a colorless to white crystalline solid. Soluble in water. The primary hazard is the threat to the environment. Immediate steps should be taken to limit spread to the environment. Used as a fertilizer, in pharmaceuticals, in food processing, and for many other uses.
• Liquid; Dry Powder; Liquid; Liquid; Other Solid; CBI; Dry Powder; Other Solid
• Anhydrous disodium hydrogen phosphate is a white, hygroscopic, odourless powder. Hydrated forms available include the dihydrate: a white crystalline, odourless solid; the heptahydrate: white, odourless, efflorescent crystals or granular powder; and the dodecahydrate: white, efflorescent, odourless powder or crystals
• Colorless or white hygroscopic solid; [Hawley] White powder; [MSDSonline]
• WHITE OR COLOURLESS HYGROSCOPIC CRYSTALS OR POWDER.
• Colorless, translucent crystals or white powder.

Regulatory Status

Regulatory & Food Contact

FDA Substance added to food: ANTICAKING AGENT OR FREE-FLOW AGENT, ANTIMICROBIAL AGENT, DRYING AGENT, EMULSIFI FDA Inventory of Food Contact Substances Listed in 21 CFR: FCS ACIDITY_REGULATOR; EMULSIFIER; TEXTURIZER; THICKENER: Food Additives ANTICAKING AGENT OR FREE-FLOW AGENT, ANTIMICROBIAL AGENT, DRYING AGENT, EMULSIFIER OR EMULSIFIER SALT, FLAVOR Group MTDI for phosphorus from all sources, expressed as P TRS 683-JECFA 26/25

GHS notification summary

70.3% (744 / 1059)

GHS Hazard Classification

GHS notification summary	70.3% (744 / 1059)
Reported hazard statements	H319 (29.7%)

Documented Uses

• CIR ingredient: Disodium Phosphate
• Used as emulsifier and buffer in foods and pharmaceuticals, metal phosphatising/electroplating reagent, scale inhibitor (boiling water treatment), textile/leather auxiliary, sequestrant, mordant in dyeing, fireproofing agent, reagent and buffer in analytical chemistry, cathartic, and veterinary laxative; Also used for weighting silk and in pottery glazes/porcelain/enamels, tanning, and soldering/brazing (instead of borax); [HSDB] Used in fertilizers, galvanoplastics, and as a dietary supplement; [Hawley]
• Brazing [Category: Heat or Machine]
• Electroplating [Category: Plate]
• Soldering [Category: Heat or Machine]
• Textiles (Fiber & Fabric Manufacturing) [Category: Industry]

Synonyms

7558-79-4; Sodium phosphate dibasic; DISODIUM PHOSPHATE; Disodium hydrogen phosphate; Disodium hydrogenorthophosphate; Acetest; Sodium phosphate, dibasic; Dibasic sodium phosphate; Disodium acid phosphate; Soda phosphate; Exsiccated sodium phosphate; disodium hydrogenphosphate; Disodium orthophosphate; Phosphoric acid, disodium salt; Sodium hydrogen phosphate; Sodium monohydrogen phosphate

Frequently Asked Questions

What are the CAS number and molecular formula of Disodium phosphate dodecahydrate?

CAS 10039-32-4; molecular formula Na2HPO4; molecular weight — g/mol.

What other names is Disodium phosphate dodecahydrate known by?

7558-79-4, Sodium phosphate dibasic, DISODIUM PHOSPHATE, Disodium hydrogen phosphate, Disodium hydrogenorthophosphate, Acetest.

What is the regulatory status of Disodium phosphate dodecahydrate?

Documented regulatory listings: FDA Substance added to food: ANTICAKING AGENT OR FREE-FLOW AGENT, ANTIMICROBIAL AGENT, DRYING AGENT, EMULSIFI; FDA Inventory of Food Contact Substances Listed in 21 CFR: FCS; ACIDITY_REGULATOR; EMULSIFIER; TEXTURIZER; THICKENER: Food Additives.

Is Disodium phosphate dodecahydrate classified as hazardous?

70.3% of GHS notifications report no hazard classification (744 of 1059).

What are the key physical properties of Disodium phosphate dodecahydrate?

Solubility: 11.8 g/100 g water at 25 °C; Density: 0.5-1.2 g/cm³; Decomposition: ~250 °C; pH: pH = 9.1 for 1% aq soln at 25 °C.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.