Persulfate

A persulfate (sometimes known as peroxysulfate or peroxodisulfate)^[1] is a compound containing the anions SO²⁻
₅ or S
₂O²⁻
₈.^[2] 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.^[3][4]

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