Topic summary
Peroxydiphosphoric acid
Peroxydiphosphoric acid ((HO2P(O)O−OP(O)(OH)2) is an oxyacid of phosphorus. Its salts are known as peroxydiphosphates. It is closely related to peroxymonophosphoric acid. These compounds (and their salts) are in turn related to the peroxydisulfuric acid and peroxysulfuric acid. These compounds are all colorless. In terms of structure, peroxydiphosphoric acid features two tetrahedral phosphorus centers linked by a peroxide group.