磷酸钾

Description

Potassium Phosphate Tribasic is identified by CAS 7778-53-2, molecular formula K3O4P and molecular weight 211.84 g/mol. UNII 16D59922JU; ChEBI 190301; InChIKey LWIHDJKSTIGBAC-UHFFFAOYSA-K.

Identification

CAS Registry Number	7778-53-2
PubChem CID	62657
Molecular formula	K3O4P
Molecular weight	211.84 g/mol
IUPAC name	tripotassium;phosphate
InChIKey	LWIHDJKSTIGBAC-UHFFFAOYSA-K
UNII (FDA)	16D59922JU
ChEBI ID	CHEBI:190301

Computed Descriptors

Molecular Weight	212.266
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	4
Rotatable Bond Count	0
Exact Mass	211.8445399
Monoisotopic Mass	211.8445399
Topological Polar Surface Area	86.3
Heavy Atom Count	8
Formal Charge	0
Complexity	36.8

Physical description & handling notes

• Other Solid
• Other Solid; Dry Powder; Liquid
• Colourless or white, odourless hygroscopic crystals or granules. Hydrated forms available include the monohydrate and trihydrate
• Deliquescent solid; [Merck Index] Colorless or white odorless, hygroscopic solid; [JECFA] White granules; [Alfa Aesar MSDS]
• Freely soluble in water. Insoluble in ethanol
• Between 11,5 and 12,3 (1 % solution)

Regulatory Status

Regulatory & Food Contact	FDA Substance added to food: EMULSIFIER OR EMULSIFIER SALT, PH CONTROL AGENT, STABILIZER OR THICKENER FDA Inventory of Food Contact Substances Listed in 21 CFR: FCS ACIDITY_REGULATOR; SEQUESTRANT; STABILIZER: Food Additives Group MTDI for phosphorus from all sources, expressed as P TRS 683-JECFA 26/25 FAS 17-JECFA 26/151
GHS notification summary	3.2% (66 / 2041)

GHS Hazard Classification

GHS notification summary	3.2% (66 / 2041)
Reported hazard statements	H315 (78.1%), H318 (22.1%), H319 (74.6%), H335 (86.3%), H302, H314

Documented Uses

• Used as emulsifier, pH control agent, and stabilizer or thickener in foods; [ExPub: FDA] Used as buffer, sequestrant, and emulsion stabilizer in foods; [JECFA] Formerly used in hospital germicide detergents, (registration cancelled in 1986), liquid bathroom cleansers (cancelled in 1989), and laboratory bactericidal cleansers (cancelled in 1989); [NPIRS]
• Using Disinfectants or Biocides [Category: Clean]
• Food Additives -> ACIDITY_REGULATOR; SEQUESTRANT; STABILIZER -> JECFA Functional Classes
• Not Known or Reasonably Ascertainable
• Information on 3 consumer products that contain Potassium phosphate, tribasic in the following categories is provided:
• 2023: 5,000,000 - <10,000,000 lb

Synonyms

7778-53-2; Tripotassium phosphate; Potassium phosphate tribasic; Tripotassium orthophosphate; Phosphoric acid, tripotassium salt; Potassium orthophosphate; Potassium phosphate, tribasic; Caswell No. 700A; Potassium phosphate (K3PO4); CCRIS 7321; tribasic potassium phosphate; EINECS 231-907-1; Potassium pentahydrogen bis(phosphate); EPA Pesticide Chemical Code 076407; 16D59922JU; Phosphoric acid potassium salt (1:3)

Frequently Asked Questions

What are the CAS number and molecular formula of Potassium Phosphate Tribasic?

CAS 7778-53-2; molecular formula K3O4P; molecular weight 211.84 g/mol.

What other names is Potassium Phosphate Tribasic known by?

7778-53-2, Tripotassium phosphate, Potassium phosphate tribasic, Tripotassium orthophosphate, Phosphoric acid, tripotassium salt, Potassium orthophosphate.

What is the regulatory status of Potassium Phosphate Tribasic?

Documented regulatory listings: FDA Substance added to food: EMULSIFIER OR EMULSIFIER SALT, PH CONTROL AGENT, STABILIZER OR THICKENER; FDA Inventory of Food Contact Substances Listed in 21 CFR: FCS; ACIDITY_REGULATOR; SEQUESTRANT; STABILIZER: Food Additives.

Is Potassium Phosphate Tribasic classified as hazardous?

3.2% of GHS notifications report no hazard classification (66 of 2041).

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.