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Names | |
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Other names
D-Ox, Hydrolin, Reductone
sodium hydrosulfite, sodium sulfoxylate, Sulfoxylate Vatrolite, Virtex L Hydrosulfit, Prayon Blankit, Albite A, Konite Zepar, Burmol, Arostit | |
Identifiers | |
3D model (JSmol)
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ChEBI | |
ChemSpider | |
ECHA InfoCard | 100.028.991 |
EC Number |
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PubChem CID
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RTECS number |
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UNII | |
UN number | 1384 |
CompTox Dashboard (EPA)
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Properties | |
Na2S2O4 | |
Molar mass | 174.107 g/mol (anhydrous) 210.146 g/mol (dihydrate) |
Appearance | white to grayish crystalline powder light-lemon colored flakes |
Odor | faint sulfur odor |
Density | 2.38 g/cm3 (anhydrous) 1.58 g/cm3 (dihydrate) |
Melting point | 52 °C (126 °F; 325 K) |
Boiling point | Decomposes |
18.2 g/100 mL (anhydrous, 20 °C) 21.9 g/100 mL (Dihydrate, 20 °C) | |
Solubility | slightly soluble in alcohol |
Hazards | |
GHS labelling: | |
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Danger | |
H251, H302 | |
P235+P410, P264, P270, P280, P301+P312, P330, P407, P413, P420, P501 | |
NFPA 704 (fire diamond) | |
Flash point | 100 °C (212 °F; 373 K) |
200 °C (392 °F; 473 K) | |
Related compounds | |
Other anions
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Sodium sulfite Sodium sulfate |
Related compounds
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Sodium thiosulfate Sodium bisulfite Sodium metabisulfite Sodium bisulfate |
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 dithionite (also known as sodium hydrosulfite) is a white crystalline powder with a sulfurous odor. Although it is stable in dry air, it decomposes in hot water and in acid solutions.