Sodium bisulfite
chemical compound
Sodium bisulfite, also known as sodium hydrogen sulfate, is a chemical compound. Its chemical formula is NaHSO3. It is made of sodium and bisulfite ions. It is a white solid with an odor of sulfur dioxide. It can be made by reacting smaller amounts of sodium dioxide and sodium hydroxide or sodium bicarbonate. If too much sodium hydroxide is used, sodium disulfite is made instead.
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| Names | ||
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| IUPAC name
Sodium hydrogen sulfite
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| Other names
E222, sodium bisulphite
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| Identifiers | ||
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3D model (JSmol)
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| ChEBI | ||
| ChEMBL | ||
| ChemSpider | ||
| ECHA InfoCard | 100.028.680 | |
| E number | E222 (preservatives) | |
PubChem CID
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| RTECS number |
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CompTox Dashboard (EPA)
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| Properties | ||
| NaHSO3 | ||
| Molar mass | 104.061 g/mol | |
| Appearance | White solid | |
| Odor | Slight sulfurous odor | |
| Density | 1.48 g/cm3 | |
| Melting point | 150 °C (302 °F; 423 K) | |
| Boiling point | 315 °C (599 °F; 588 K) | |
| 42 g/100 mL | ||
Refractive index (nD)
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1.526 | |
| Hazards | ||
| EU classification | Harmful (Xn) | |
| NFPA 704 |
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| R-phrases | R22 R31 | |
| S-phrases | (S2), S25, S46 | |
| Flash point | Non-flammable | |
| U.S. Permissible exposure limit (PEL) |
none[1] | |
| Related compounds | ||
| Other anions | {{{value}}} | |
| Other cations | {{{value}}} | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | ||
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| Infobox references | ||
Related pages
changeReferences
change- ↑ NIOSH Pocket Guide to Chemical Hazards. "#0561". National Institute for Occupational Safety and Health (NIOSH).
