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 Peroxymonosulfate) ion, S2O82−

Acids

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

Example salts

 * Sodium peroxomonosulfate, Na2SO5
 * Potassium peroxymonosulfate, KHSO5
 * Sodium peroxodisulfate, Na2S2O8