Sodium pyrosulfate

Sodium pyrosulfate
Names
	IUPAC name Disodium disulfate
	Other names Sodium pyrosulphate; Disulfuric acid disodium salt, disodium disulfate; Sodium metabisulfate
Identifiers
CAS Number	13870-29-6 ;
3D model (JSmol)	Interactive image;
ChEMBL	ChEMBL111016 ;
ChemSpider	7970254;
ECHA InfoCard	100.034.190
EC Number	237-625-5;
PubChem CID	9794487;
CompTox Dashboard (EPA)	DTXSID60889631 ;
	InChI InChI=1S/2Na.H2O7S2/c;;1-8(2,3)7-9(4,5)6/h;;(H,1,2,3)(H,4,5,6)/q2*+1;/p-2 Key: JXAZAUKOWVKTLO-UHFFFAOYSA-L;
	SMILES [Na+].[Na+].[O-]S(=O)(=O)OS(=O)(=O)[O-];
Properties
Chemical formula	Na2S2O7
Molar mass	222.12 g/mol
Appearance	Translucent white crystals
Density	2.658 g/cm3
Melting point	400.9 °C (753.6 °F; 674.0 K)
Boiling point	decomposes at 460 °C (860 °F; 733 K)
Solubility in water	hydrolyses
	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

Sodium pyrosulfate is an inorganic compound with the chemical formula of Na₂S₂O₇. It is a colorless salt. It hydrolyses in water to form sodium bisulfate with a chemical formula of NaHSO4 which has a pH of around 1.