Potassium peroxymonosulfate

Potassium peroxymonosulfate is widely used as an oxidizing agent, for example, in pools and spas (usually referred to as monopersulfate or "MPS"). It is the potassium salt of peroxymonosulfuric acid. Usually potassium peroxymonosulfate is available as the triple salt 2KHSO5·KHSO4·K2SO4, known as Oxone.

"Oxone" redirects here. Not to be confused with the gas ozone.
Not to be confused with Potassium persulfate.
Potassium peroxymonosulfate
Names
IUPAC name
Potassium peroxysulfate
Other names
Caroat
Oxone
potassium monopersulfate
MPS
KMPS
potassium caroate
non-chlorine shock
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.030.158
UNII
  • 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
  • [K+].[O-]S(=O)(=O)OO
Properties
KHSO5
Molar mass 152.2 g/mol (614.76 g/mol as triple salt)
Appearance Off-white powder
Decomposes
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 Oxidant, corrosive
NFPA 704 (fire diamond)
3
0
1
Safety data sheet (SDS) Degussa Caroat MSDS
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

The standard electrode potential for potassium peroxymonosulfate is +1.81 V with a half reaction generating the hydrogen sulfate (pH = 0):

HSO−5 + 2H+ + 2e− → HSO−4 + H2O
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