Tripotassium phosphate

Tripotassium phosphate
	Unit cell of tripotassium phosphate.
Names
	IUPAC name Potassium phosphate
	Systematic IUPAC name Potassium tetraoxidophosphate(3−)
	Other names Potassium phosphate, tribasic
Identifiers
CAS Number	7778-53-2 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:190301;
ChemSpider	56408 ;
ECHA InfoCard	100.029.006
EC Number	231-907-1;
E number	E340(iii) (antioxidants, ...)
PubChem CID	62657;
UNII	16D59922JU ;
CompTox Dashboard (EPA)	DTXSID3043994 ;
	InChI InChI=1S/3K.H3O4P/c;;;1-5(2,3)4/h;;;(H3,1,2,3,4)/q3*+1;/p-3 Key: LWIHDJKSTIGBAC-UHFFFAOYSA-K ;
	SMILES [K+].[K+].[K+].[O-]P([O-])([O-])=O;
Properties
Chemical formula	K3PO4
Molar mass	212.27 g/mol
Appearance	White deliquescent powder
Density	2.564 g/cm3 (17 °C)
Melting point	1,380 °C (2,520 °F; 1,650 K)
Solubility in water	90 g/100 mL (20 °C)
Solubility in ethanol	Insoluble
Basicity (pKb)	1.6
Structure
Crystal structure	Primitive orthorhombic
Space group	Pnma, No. 62
Lattice constant	a = 1.123772 nm, b = 0.810461 nm, c = 0.592271 nm
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Irritant
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H319
Precautionary statements	P264, P280, P305+P351+P338, P337+P313
NFPA 704 (fire diamond)	2 0 0
Flash point	Non-flammable
Safety data sheet (SDS)	MSDS
Related compounds
Other cations	Trisodium phosphate; Triammonium phosphate; Tricalcium phosphate
Related compounds	Monopotassium phosphate; Dipotassium phosphate
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Tripotassium phosphate, also called tribasic potassium phosphate is a water-soluble salt with the chemical formula K₃PO₄^.(H₂O)_x (x = 0, 3, 7, 9). Tripotassium phosphate is basic: a 1% aqueous solution has a pH of 11.8.