Peroxydisulfuric acid

Peroxydisulfuric acid
IUPAC name	μ-peroxido-bis(hydroxidodioxidosulfur) peroxydisulfuric acid
Other names	Persulfuric acid
Identifiers
InChI	InChI=1/H2O8S2/c1-9(2,3)7-8-10(4,5)6/h(H,1,2,3)(H,4,5,6)
InChIKey	JRKICGRDRMAZLK-UHFFFAOYAS
Standard InChI	InChI=1S/H2O8S2/c1-9(2,3)7-8-10(4,5)6/h(H,1,2,3)(H,4,5,6)
Standard InChIKey	JRKICGRDRMAZLK-UHFFFAOYSA-N
CAS number	[13445-49-3]
PubChem	24413
ChEBI	29268
SMILES	OS(=O)(=O)OOS(=O)(=O)O
Properties
Molecular formula	H2O8S2
Molar mass	194.14 g mol−1
Appearance	colourless solid
Melting point	65 °C, 338 K, 149 °F decomp.
Solubility in water	very soluble
Related compounds
Other compounds	Potassium persulfate
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

Peroxydisulfuric is a sulfur oxoacid with the chemical formula H₂S₂O₈. In structural terms it can be written HO₃SOOSO₃H. It is one of a group of sulfur oxoacids, its salts, commonly known as persulfates, are industrially important but the acid itself is not. The salts contain the peroxydisulfate ion, S₂O₈²⁻, with O–O = 131 pm and S–O_µ = 150 pm.