Potassium sulfate

Potassium sulfate
Arcanite
Arcanite
Potassium sulfate
Names
Other names
Potassium sulphate
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.029.013 Edit this at Wikidata
EC Number
  • 231-915-5
E number E515(i) (acidity regulators, ...)
KEGG
RTECS number
  • TT5900000
UNII
  • InChI=1S/2K.H2O4S/c;;1-5(2,3)4/h;;(H2,1,2,3,4)/q2*+1;/p-2 checkY
    Key: OTYBMLCTZGSZBG-UHFFFAOYSA-L checkY
  • InChI=1/2K.H2O4S/c;;1-5(2,3)4/h;;(H2,1,2,3,4)/q2*+1;/p-2
    Key: OTYBMLCTZGSZBG-NUQVWONBAU
  • [K+].[K+].[O-]S([O-])(=O)=O
Properties
K2SO4
Molar mass 174.259 g/mol
Appearance White solid
Odor odorless
Density 2.66 g/cm3[1]
Melting point 1,069[2] °C (1,956 °F; 1,342 K)
Boiling point 1,689 °C (3,072 °F; 1,962 K)
111 g/L (20 °C)
120 g/L (25 °C)
240 g/L (100 °C)
1.32 (120 g/L)
Solubility slightly soluble in glycerol
insoluble in acetone, alcohol, CS2
−67.0·10−6 cm3/mol
1.495
Structure
orthorhombic
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
Irritant
GHS labelling:
GHS07: Exclamation mark
Warning
H318
P280, P305+P351+P338, P310
Flash point Non-flammable
Lethal dose or concentration (LD, LC):
6600 mg/kg (oral, rat)[3]
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).
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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.

  1. ^ Patnaik, Pradyot (2002). Handbook of Inorganic Chemicals. McGraw-Hill. ISBN 978-0-07-049439-8.
  2. ^ Windholtz, M; Budavari, S, eds. (1983). The Merck Index. Rahway, New Jersey: Merck & Co.
  3. ^ Chambers, Michael. "Potassium sulfate RN: 7778-80-5". ChemIDplus. United States National Library of Medicine.