Potassium persulfate

Potassium persulfate
Names
	Other names potassium peroxydisulfate; Anthion; potassium perdisulfate;
Identifiers
CAS Number	7727-21-1 ;
3D model (JSmol)	Interactive image;
ChemSpider	22821 ;
ECHA InfoCard	100.028.893
EC Number	231-781-8;
E number	E922 (glazing agents, ...)
PubChem CID	24412;
RTECS number	SE0400000;
UNII	6B86K0MCZC ;
UN number	1492
CompTox Dashboard (EPA)	DTXSID4029690 ;
	InChI InChI=1S/2K.H2O8S2/c;;1-9(2,3)7-8-10(4,5)6/h;;(H,1,2,3)(H,4,5,6)/q2+1;/p-2 Key: USHAGKDGDHPEEY-UHFFFAOYSA-L ; InChI=1/2K.H2O8S2/c;;1-9(2,3)7-8-10(4,5)6/h;;(H,1,2,3)(H,4,5,6)/q2+1;/p-2 Key: USHAGKDGDHPEEY-NUQVWONBAA;
	SMILES [O-]S(=O)(=O)OOS(=O)(=O)[O-].[K+].[K+];
Properties
Chemical formula	K2S2O8
Molar mass	270.322 g/mol
Appearance	white powder
Odor	odorless
Density	2.477 g/cm3
Melting point	< 100 °C (212 °F; 373 K) (decomposes)
Solubility in water	1.75 g/100 mL (0 °C) ; 4.49 g/100 mL (20 °C)
Solubility	insoluble in alcohol
Refractive index (nD)	1.467
Structure
Crystal structure	triclinic
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H272, H302, H315, H317, H319, H334, H335, H371
Precautionary statements	P220, P261, P280, P305+P351+P338, P342+P311
NFPA 704 (fire diamond)	2 0 1 OX
Flash point	Non-flammable
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	802 mg/kg (oral, rat)
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). verify (what is ?) Infobox references

Potassium persulfate is the inorganic compound with the formula K₂ S₂O₈. 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.

Names



Other names potassium peroxydisulfate Anthion potassium perdisulfate
Identifiers
CAS Number	7727-21-1^Y
3D model (JSmol)	Interactive image
ChemSpider	22821^N
ECHA InfoCard	100.028.893
EC Number	231-781-8
E number	E922 (glazing agents, ...)
PubChem CID	24412
RTECS number	SE0400000
UNII	6B86K0MCZC^Y
UN number	1492
CompTox Dashboard (EPA)	DTXSID4029690
InChI InChI=1S/2K.H2O8S2/c;;1-9(2,3)7-8-10(4,5)6/h;;(H,1,2,3)(H,4,5,6)/q2+1;/p-2^N Key: USHAGKDGDHPEEY-UHFFFAOYSA-L^N InChI=1/2K.H2O8S2/c;;1-9(2,3)7-8-10(4,5)6/h;;(H,1,2,3)(H,4,5,6)/q2+1;/p-2 Key: USHAGKDGDHPEEY-NUQVWONBAA
SMILES [O-]S(=O)(=O)OOS(=O)(=O)[O-].[K+].[K+]
Properties
Chemical formula	K₂S₂O₈
Molar mass	270.322 g/mol
Appearance	white powder
Odor	odorless
Density	2.477 g/cm³
Melting point	< 100 °C (212 °F; 373 K) (decomposes)
Solubility in water	1.75 g/100 mL (0 °C) 4.49 g/100 mL (20 °C)
Solubility	insoluble in alcohol
Refractive index (n_D)	1.467
Structure
Crystal structure	triclinic
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H272, H302, H315, H317, H319, H334, H335, H371
Precautionary statements	P220, P261, P280, P305+P351+P338, P342+P311
NFPA 704 (fire diamond)	2 0 1 OX
Flash point	Non-flammable
Lethal dose or concentration (LD, LC):
LD₅₀ (median dose)	802 mg/kg (oral, rat)
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). N verify (what is ^YN ?) Infobox references