Sodium triphosphate

Description

Sodium triphosphate · CAS 7758-29-4 · Na3PO4. UNII SX01TZO3QZ. Melting Point: 170.06 °F (USCG, 1999); Melting Point: 170 °F; Melting Point: 1583 °C.

Identification

CAS Registry Number	7758-29-4
PubChem CID	24243
Molecular formula	Na3PO4
IUPAC name	trisodium;phosphate
UNII (FDA)	SX01TZO3QZ

Computed Descriptors

Molecular Weight	163.941
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	4
Rotatable Bond Count	0
Exact Mass	163.92272832
Monoisotopic Mass	163.92272832
Topological Polar Surface Area	86.3
Heavy Atom Count	8
Formal Charge	0
Complexity	36.8

Physical & Chemical Properties

Melting Point	170.06 °F (USCG, 1999)
Melting Point	170 °F
Melting Point	1583 °C
Solubility	14.5 g/100 g water at 25 °C
Solubility	25.8 g sol in 100 g water at 20 °C
Density	2.54 g/cu cm
Decomposition	75 °C

Physical description & handling notes

• Sodium phosphate, tribasic appears as a colorless to white crystalline solid. Noncombustible.
• CBI; Large Crystals; Other Solid; Dry Powder; Liquid
• White odourless crystals, granules or crystalline powder
• Odorless, water soluble, colorless to white crystals; [CAMEO]
• Colorless to white solid; [ICSC] White odorless powder; [MSDSonline]
• COLOURLESS-TO-WHITE HYGROSCOPIC CRYSTALS.

Regulatory Status

Regulatory & Food Contact

FDA Substance added to food: ANTICAKING AGENT OR FREE-FLOW AGENT, DRYING AGENT, EMULSIFIER OR EMULSIFIER SALT FDA Inventory of Food Contact Substances Listed in 21 CFR: FCS ACIDITY_REGULATOR; SEQUESTRANT; STABILIZER: Food Additives Trisodium phosphate is obtained from aqueous solutions and crystallises in the anhydrous form and with 1/2, 1, ANTICAKING AGENT OR FREE-FLOW AGENT, DRYING AGENT, EMULSIFIER OR EMULSIFIER SALT, FORMULATION AID, HUMECTANT, Group MTDI for phosphorus from all sources, expressed as P

GHS notification summary

5.5% (77 / 1393)

GHS Hazard Classification

GHS notification summary	5.5% (77 / 1393)
Reported hazard statements	H315 (90.2%), H319 (90.1%), H335 (85.1%), H314, H318

Documented Uses

• CIR ingredient: Trisodium Phosphate
• Used in soaps and detergents; Used in paper and leather manufacturing; [CHEMINFO] Used in scouring powders, photographic developers, water softeners, boiler scale removers, and food additives; [HSDB]
• Pulp and Paper Processing [Category: Industry]
• Leather Tanning and Processing [Category: Industry]
• Photographic Processing [Category: Other]
• Used in photographic developers and detergents ; Also used to clarify sugar, remove boiler scale, soften water, make paper, and tan leather; [Merck Index] Used in dairy substitutes, to remove insecticides from fruit, and to inhibit mold; [HSDB] Used mainly in the dodecahydrate form as an alkaline source, e.g., heavy-duty cleaner and scouring agent; [AIHA]

Synonyms

TRISODIUM PHOSPHATE; 7601-54-9; Trisodium orthophosphate; Tromete; Tribasic sodium phosphate; Phosphoric acid, trisodium salt; Oakite; Phosphoric acid trisodium salt; Sodium phosphate, anhydrous; Trinatriumphosphat; Nutrifos STP; Dri-Tri; Antisal 4; Tertiary sodium phosphate; Sodium phosphate (Na3PO4); Tribasic sodium orthophosphate

Frequently Asked Questions

What are the CAS number and molecular formula of Sodium triphosphate?

CAS 7758-29-4; molecular formula Na3PO4; molecular weight — g/mol.

What other names is Sodium triphosphate known by?

TRISODIUM PHOSPHATE, 7601-54-9, Trisodium orthophosphate, Tromete, Tribasic sodium phosphate, Phosphoric acid, trisodium salt.

What is the regulatory status of Sodium triphosphate?

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

Is Sodium triphosphate classified as hazardous?

5.5% of GHS notifications report no hazard classification (77 of 1393).

What are the key physical properties of Sodium triphosphate?

Melting Point: 170.06 °F (USCG, 1999); Melting Point: 170 °F; Melting Point: 1583 °C; Solubility: 14.5 g/100 g water 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.