Potassium persulfate
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Not to be confused with Potassium peroxymonosulfate.
Potassium persulfate is the inorganic compound with the formula K2S2O8. Also known as potassium peroxydisulfate, it is a white solid that is sparingly soluble in cold water, but dissolves better in warm water. This salt is a powerful oxidant, commonly used to initiate polymerizations.
Quick Facts Names, Identifiers ...
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Other names
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Identifiers | |
3D model (JSmol) |
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ChemSpider |
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ECHA InfoCard | 100.028.893 |
EC Number |
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E number | E922 (glazing agents, ...) |
PubChem CID |
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RTECS number |
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UNII | |
UN number | 1492 |
CompTox Dashboard (EPA) |
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Properties | |
K2S2O8 | |
Molar mass | 270.322 g/mol |
Appearance | white powder |
Odor | odorless |
Density | 2.477 g/cm3[1] |
Melting point | < 100 °C (212 °F; 373 K) (decomposes) |
1.75 g/100 mL (0 °C) 4.49 g/100 mL (20 °C) | |
Solubility | insoluble in alcohol |
Refractive index (nD) |
1.467 |
Structure | |
triclinic | |
Hazards | |
GHS labelling: | |
Danger | |
H272, H302, H315, H317, H319, H334, H335, H371 | |
P220, P261, P280, P305+P351+P338, P342+P311 | |
NFPA 704 (fire diamond) | |
Flash point | Non-flammable |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
802 mg/kg (oral, rat)[2] |
Safety data sheet (SDS) | ICSC 1133 |
Related compounds | |
Other anions |
Potassium sulfite Potassium sulfate Potassium peroxymonosulfate |
Other cations |
Sodium persulfate Ammonium 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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