Sodium bisulfite
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.
| Sodium bisulfite | |
|---|---|
| |
| |
| IUPAC name | Sodium hydrogen sulfite |
| Other names | E222, sodium bisulphite |
| Identifiers | |
| CAS number | |
| PubChem | |
| ChEBI | CHEBI:26709 |
| RTECS number | VZ2000000 |
| SMILES | [Na+].[O-]S(=O)O |
| Properties | |
| Molecular formula | NaHSO3 |
| Molar mass | 104.061 g/mol |
| Appearance | White solid |
| Odor | Slight sulfurous odor |
| Density | 1.48 g/cm3 |
| Melting point |
150 °C, 423 K, 302 °F |
| Boiling point | |
| Solubility in water | 42 g/100 mL |
| Refractive index (nD) | 1.526 |
| Hazards | |
| EU classification | Harmful (Xn) |
| NFPA 704 |
0
2
1
|
| 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 | Sodium sulfite Sodium metabisulfite |
| Other cations | Potassium bisulfite |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) | |
Related pages
References
- ↑ NIOSH Pocket Guide to Chemical Hazards. "#0561". National Institute for Occupational Safety and Health (NIOSH).
