Persulfate

The term persulfate refers to ions or compounds with more oxygen than normal sulfates.

These do not have sulfur in a different oxidation state; rather, they contain peroxide units, where two oxygens take the place of one in a normal sulfate; the oxygen atoms are in oxidation state −1.

The main forms are "peroxomonosulfates" and "peroxodisulfates".

Ions

* Peroxomonosulfate (or Peroxymonosulfate) ion, SO₅²⁻
* Peroxodisulfate (or Peroxydisulfate) ion, S₂O₈²⁻

Acids

* Peroxymonosulfuric acid (peuric acid), H₂SO₅
* Peroxydisulfuric acid, H₂S₂O₈

Example salts

* Sodium peroxomonosulfate, Na₂SO₅
* Potassium peroxymonosulfate, KHSO₅
* Sodium peroxodisulfate, Na₂S₂O₈
* Ammonium peroxydisulfate, (NH₄)₂S₂O₈