Potassium sulfate
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Not to be confused with potassium sulfide.
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.
Quick Facts Names, Identifiers ...
Arcanite | |
Names | |
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Other names
Potassium sulphate | |
Identifiers | |
3D model (JSmol) |
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ChEBI | |
ChEMBL | |
ChemSpider |
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ECHA InfoCard | 100.029.013 |
EC Number |
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E number | E515(i) (acidity regulators, ...) |
KEGG |
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PubChem CID |
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RTECS number |
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UNII | |
CompTox Dashboard (EPA) |
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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) | |
Solubility product (Ksp) |
1.32 (120 g/L) |
Solubility | slightly soluble in glycerol insoluble in acetone, alcohol, CS2 |
−67.0·10−6 cm3/mol | |
Refractive index (nD) |
1.495 |
Structure | |
orthorhombic | |
Hazards | |
Occupational safety and health (OHS/OSH): | |
Main hazards |
Irritant |
GHS labelling: | |
Warning | |
H318 | |
P280, P305+P351+P338, P310 | |
Flash point | Non-flammable |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
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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