磷酸钾

Description

Potassium Phosphates · CAS 7778-77-0 · KH2PO4. UNII 4J9FJ0HL51. Melting Point: 253 °C; Density: 2.34 g/cu cm; Density: 2.34 g/cm³.

Identification

CAS Registry Number	7778-77-0
PubChem CID	516951
Molecular formula	KH2PO4
IUPAC name	potassium dihydrogen phosphate
UNII (FDA)	4J9FJ0HL51

Computed Descriptors

Molecular Weight	136.086
Hydrogen Bond Donor Count	2
Hydrogen Bond Acceptor Count	4
Rotatable Bond Count	0
Exact Mass	135.93277702
Monoisotopic Mass	135.93277702
Topological Polar Surface Area	80.6
Heavy Atom Count	6
Formal Charge	0
Complexity	61.9

Physical & Chemical Properties

Melting Point	253 °C
Density	2.34 g/cu cm
Density	2.34 g/cm³
pH	pH = 4.4 to 4.7

Physical description & handling notes

• Liquid; Dry Powder; Other Solid; Large Crystals; CBI
• Liquid; Other Solid
• Odourless, colourless crystals or white granular or crystalline powder
• Colorless or white solid; [Merck Index] Deliquescent; [CHEMINFO] White crystalline solid; [MSDSonline]
• COLOURLESS CRYSTALS OR WHITE CRYSTALLINE POWDER.
• Colorless crystals or white granular powder

Regulatory Status

Regulatory & Food Contact	FDA Substance added to food: MALTING OR FERMENTING AID, NUTRIENT SUPPLEMENT, PH CONTROL AGENT, STABILIZER OR FDA Inventory of Food Contact Substances Listed in 21 CFR: FCS ACIDITY_REGULATOR; SEQUESTRANT; YEAST_FOOD: Food Additives MALTING OR FERMENTING AID, NUTRIENT SUPPLEMENT, PH CONTROL AGENT, STABILIZER OR THICKENER Group MTDI for phosphorus from all sources, expressed as P TRS 683-JECFA 26/25
GHS notification summary	90.7% (794 / 875)

GHS Hazard Classification

GHS notification summary	90.7% (794 / 875)

Documented Uses

• CIR ingredient: Potassium Phosphate
• Used in buffers (determination of pH, pharmaceutical production, urinary acidifier, paper processing, baking powder, and food), nutrient solutions, yeast foods, special liquid fertilizers, sonar systems and other electronic applications; [HSDB] Used as a nutritional supplement in foods, a nonlinear optical material for laser use, and in wastewater treatment; [CHEMINFO]
• Pulp and Paper Processing [Category: Industry]
• Sewer and Wastewater Treatment [Category: Industry]
• In buffers for determination of pH. Pharmaceutic aid (buffering agent).
• Baking powder; nutrient solutions; yeast foods; buffer and sequestrant, lab reagent.

Synonyms

Potassium dihydrogen phosphate; 7778-77-0; Potassium phosphate monobasic; MONOPOTASSIUM PHOSPHATE; Monobasic potassium phosphate; Potassium acid phosphate; Phosphoric acid, monopotassium salt; Potassium phosphate, monobasic; Monopotassium monophosphate; Monopotassium orthophosphate; Monopotassium dihydrogen phosphate; potassium biphosphate; Potassium dihydrogen orthophosphate; KH2PO4; Sorensen's potassium phosphate; Potassium dihydrogenorthophosphate

Frequently Asked Questions

What are the CAS number and molecular formula of Potassium Phosphates?

CAS 7778-77-0; molecular formula KH2PO4; molecular weight — g/mol.

What other names is Potassium Phosphates known by?

Potassium dihydrogen phosphate, 7778-77-0, Potassium phosphate monobasic, MONOPOTASSIUM PHOSPHATE, Monobasic potassium phosphate, Potassium acid phosphate.

What is the regulatory status of Potassium Phosphates?

Documented regulatory listings: FDA Substance added to food: MALTING OR FERMENTING AID, NUTRIENT SUPPLEMENT, PH CONTROL AGENT, STABILIZER OR ; FDA Inventory of Food Contact Substances Listed in 21 CFR: FCS; ACIDITY_REGULATOR; SEQUESTRANT; YEAST_FOOD: Food Additives.

Is Potassium Phosphates classified as hazardous?

90.7% of GHS notifications report no hazard classification (794 of 875).

What are the key physical properties of Potassium Phosphates?

Melting Point: 253 °C; Density: 2.34 g/cu cm; Density: 2.34 g/cm³; pH: pH = 4.4 to 4.7.

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.