Potassium sulfate

Potassium sulfate
	Arcanite
Names
	Other names Potassium sulphate
Identifiers
CAS Number	7778-80-5 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:32036 ;
ChEMBL	ChEMBL2021424 ;
ChemSpider	22915 ;
ECHA InfoCard	100.029.013
EC Number	231-915-5;
E number	E515(i) (acidity regulators, ...)
KEGG	D01726 ;
PubChem CID	24507;
RTECS number	TT5900000;
UNII	1K573LC5TV ;
CompTox Dashboard (EPA)	DTXSID6029701 ;
	InChI InChI=1S/2K.H2O4S/c;;1-5(2,3)4/h;;(H2,1,2,3,4)/q2+1;/p-2 Key: OTYBMLCTZGSZBG-UHFFFAOYSA-L ; InChI=1/2K.H2O4S/c;;1-5(2,3)4/h;;(H2,1,2,3,4)/q2+1;/p-2 Key: OTYBMLCTZGSZBG-NUQVWONBAU;
	SMILES [K+].[K+].[O-]S([O-])(=O)=O;
Properties
Chemical formula	K2SO4
Molar mass	174.259 g/mol
Appearance	White solid
Odor	odorless
Density	2.66 g/cm3
Melting point	1,069 °C (1,956 °F; 1,342 K)
Boiling point	1,689 °C (3,072 °F; 1,962 K)
Solubility in water	111 g/L (20 °C) ; 120 g/L (25 °C) ; 240 g/L (100 °C)
Solubility product (Ksp)	1.32 (120 g/L)
Solubility	slightly soluble in glycerol ; insoluble in acetone, alcohol, CS2
Magnetic susceptibility (χ)	−67.0·10−6 cm3/mol
Refractive index (nD)	1.495
Structure
Crystal structure	orthorhombic
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Irritant
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H318
Precautionary statements	P280, P305+P351+P338, P310
Flash point	Non-flammable
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	6600 mg/kg (oral, rat)
Safety data sheet (SDS)	External MSDS
Related compounds
Other anions	Potassium selenate; Potassium tellurate
Other cations	Lithium sulfate; Sodium sulfate; Rubidium sulfate; Caesium sulfate
Related compounds	Potassium hydrogen sulfate; Potassium sulfite; Potassium bisulfite; Potassium persulfate
	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

Potassium sulfate (US) or potassium sulphate (UK), also called sulphate of potash (SOP), arcanite, or archaically potash of sulfur, is the inorganic compound with formula K₂SO₄, a white water-soluble solid. It is commonly used in fertilizers, providing both potassium and sulfur.