Persulfate

The term persulfate (sometimes known as peroxysulfate) refers to ions or compounds containing the anions SO2−
5 or S
2O2−
8.^[1] The anion SO2−
5 contains one peroxide group per sulfur center, whereas in S
2O2−
8, the peroxide group bridges the sulfur atoms. In both cases, sulfur adopts the normal tetrahedral geometry typical for the S(VI) oxidation state. These salts are strong oxidizers.^[2]

Ions

• Peroxomonosulfate ion, SO2−
  5
• Peroxydisulfate S
  2O2−
  8

Acids

• Peroxymonosulfuric acid (Caro's acid), H₂SO₅
• Peroxydisulfuric acid, H₂S₂O₈

Example salts

• Sodium peroxomonosulfate, Na₂SO₅
• Potassium peroxymonosulfate, KHSO₅
• Sodium persulfate (sodium peroxydisulfate), Na₂S₂O₈
• Ammonium persulfate (ammonium peroxydisulfate), (NH₄)₂S₂O₈
• Potassium persulfate (potassium peroxydisulfate), K₂S₂O₈

References

1. Harald Jakob, Stefan Leininger, Thomas Lehmann, Sylvia Jacobi, Sven Gutewort (2005), "Peroxo Compounds, Inorganic", Ullmann's Encyclopedia of Industrial Chemistry, Weinheim: Wiley-VCH, doi:10.1002/14356007.a19_177.pub2
2. "Geo-Cleanse International". Geocleanse.com. Retrieved 2012-06-13.