Potassium peroxymonosulfate

Not to be confused with Potassium persulfate.

Potassium peroxymonosulfate, also referred to as potassium peroxysulfate and potassium monopersulfate (KMPS), is an inorganic compound with the formula KHSO₅. It is the mono-potassium salt derived from peroxymonosulfuric acid (Caro's acid). It is a constituent of the widely used oxidizing agent called Oxone, which is a triple salt with the formula 2KHSO₅·KHSO₄·K₂SO₄.^[2][3][4]

Potassium peroxymonosulfate

Names
IUPAC name Potassium peroxysulfate
Identifiers
CAS Number	10058-23-8 Y
3D model (JSmol)	Interactive image
ChemSpider	8053100 N
ECHA InfoCard	100.030.158
PubChem CID	11804954
UNII	040ZB27861 Y
CompTox Dashboard (EPA)	DTXSID1034840
InChI InChI=1S/K.H2O5S/c;1-5-6(2,3)4/h;1H,(H,2,3,4)/q+1;/p-1 N Key: OKBMCNHOEMXPTM-UHFFFAOYSA-M N InChI=1S/K.H2O4S/c;1-4-5(2)3/h;1H,(H,2,3)/q+1;/p-1 Key: GZHFEBOLZPYNER-UHFFFAOYSA-M InChI=1/K.H2O5S/c;1-5-6(2,3)4/h;1H,(H,2,3,4)/q+1;/p-1 Key: OKBMCNHOEMXPTM-REWHXWOFAJ
SMILES [K+].[O-]S(=O)(=O)OO
Properties
Chemical formula	KHSO5
Molar mass	152.2 g/mol
Appearance	white solid
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	Oxidant, corrosive
NFPA 704 (fire diamond)	[1] 3 0 1
Safety data sheet (SDS)	ChemicalBook.com SDS[1]
Related compounds
Related compounds	Potassium 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

Related salts

Organic-soluble derivatives of peroxymonosulfate include the tetra-n-butylammonium, tetraphenylphosphonium, and benzyltriphenylphosphonium salts: (nBu₄N)HSO₅, (Ph₄P)HSO₅, and (BnPh₃P)HSO₅.^[5][6] The ammonium and sodium salts of HSO−5 are also known.

Applications

The title compound is the active ingredient in oxone, which is a common disinfectant^[7] and whitening agent.^[2] It has also been investigated for use in processes aimed at delignification of wood.^[8]

Underlying these uses is the high redox potential, which for potassium peroxymonosulfate, per se, is +1.81 V.

Structure

The structure of the monohydrate has been confirmed by X-ray crystallography. This analysis reveals the expected tetrahedral sulfur center, an O-O bond length of 146 picometers, and an SOOH dihedral angle of 90°.^[9]