Names | |
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IUPAC name
Disodium disulfate
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Other names
Sodium pyrosulphate; Disulfuric acid disodium salt, disodium disulfate; Sodium metabisulfate
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Identifiers | |
3D model (JSmol)
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ChEMBL | |
ChemSpider | |
ECHA InfoCard | 100.034.190 |
EC Number |
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PubChem CID
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CompTox Dashboard (EPA)
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Properties | |
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) |
hydrolyses[2] | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Sodium pyrosulfate is an inorganic compound with the chemical formula of Na2S2O7.[1] It is a colorless salt.[3] It hydrolyses in water to form sodium bisulfate with a chemical formula of NaHSO4 which has a pH of around 1.