Peroxydisulfuric acid

Peroxydisulfuric acid
Names
	IUPAC names μ-peroxido-bis(hydroxidodioxidosulfur); peroxydisulfuric acid
	Other names Persulfuric acid, Peroxodisulfuric acid
Identifiers
CAS Number	13445-49-3 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:29268 ;
ChemSpider	22822 ;
PubChem CID	24413;
UNII	2RQ1860626 ;
CompTox Dashboard (EPA)	DTXSID00894926 ;
	InChI InChI=1S/H2O8S2/c1-9(2,3)7-8-10(4,5)6/h(H,1,2,3)(H,4,5,6) Key: JRKICGRDRMAZLK-UHFFFAOYSA-N ; InChI=1/H2O8S2/c1-9(2,3)7-8-10(4,5)6/h(H,1,2,3)(H,4,5,6)/f/h1,4H; InChI=1/H2O8S2/c1-9(2,3)7-8-10(4,5)6/h(H,1,2,3)(H,4,5,6) Key: JRKICGRDRMAZLK-UHFFFAOYAS;
	SMILES O=S(=O)(OOS(=O)(=O)O)O;
Properties
Chemical formula	H2O8S2
Molar mass	194.13 g·mol−1
Appearance	Colourless solid
Melting point	65 °C (149 °F; 338 K) (decomposes)
Solubility in water	soluble
Conjugate base	Peroxydisulfate
Related compounds
Other cations	Potassium persulfate; Sodium persulfate; Ammonium persulfate
Related compounds	Peroxymonosulfuric acid; Pyrosulfuric acid
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Peroxydisulfuric acid is an inorganic compound with a chemical formula (HO₃SO)₂. It is also called Marshall's acid after Professor Hugh Marshall, who discovered it in 1891.