Sodium Sulfite
Bleaching Agent: Sodium sulfite is extensively employed in pulp and paper manufacturing as an efficient bleaching agent, helping to preserve brightness and quality in the final products.
Pharmaceutical Applications: It contributes significantly to the stability and extended shelf-life of pharmaceutical formulations, ensuring the effectiveness and safety of medicinal products.
Water Treatment Aid: Functioning as an oxygen scavenger, sodium sulfite plays an essential role in water treatment systems.
Environmental Applications: It is also used in flue gas desulfurization processes, aiding in the reduction of sulfur oxide emissions and supporting efforts toward cleaner industrial operations.
Sodium sulfite (Na₂SO₃), a water-soluble salt derived from sulfurous acid, exhibits bleaching, desulfurization, and dechlorination capabilities, leading to its broad utilization across multiple sectors. It serves as a key bleaching agent in the pulp and paper industry.
Additionally, it helps preserve the bright appearance of certain materials. Within pharmaceuticals, it enhances the stability and prolongs the efficacy of medicinal products. It is also used as an oxygen scavenger in water treatment—as well as in flue gas desulfurization and as a stabilizing component in photographic developer solutions.
Parameters
Melting point | 500 °C |
density | 2.63 |
bulk density | 1480kg/m3 |
refractive index | 1,484 |
storage temp. | Store at +5°C to +30°C. |
solubility | H2O: 1 M at 20 °C, clear, colorless |
form | Solid |
Specific Gravity | 2.633 |
color | White to slightly yellow |
Odor | Odorless |
PH | 9.0-10.5 (25℃, 1M in H2O) |
PH Range | 9.0 - 10.5 at 126 g/l at 25 °C |
Water Solubility | 23 g/100 mL (20 ºC) |
Sensitive | Hygroscopic |
Merck | 14,8682 |
Stability: | Stable. Incompatible with strong acids. Moisture and air sensitive. |
CAS DataBase Reference | 7757-83-7(CAS DataBase Reference) |
NIST Chemistry Reference | sodium sulfite(7757-83-7) |
EPA Substance Registry System | Sodium sulfite (7757-83-7) |
Absorption | cut-off at 265nm in H2O at 1M |
Safety Information
Hazard Codes | Xn |
Risk Statements | 31-36/37/38-22-40-36/38 |
Safety Statements | 24/25-36-26-22 |
WGK Germany | 1 |
RTECS | WE2150000 |
F | 3-10 |
TSCA | Yes |
HS Code | 28321000 |
Hazardous Substances Data | 7757-83-7(Hazardous Substances Data) |
Toxicity | LD50 i.v. in mice: 175 mg/kg, Hoppe, Goble, J. Pharmacol. Exp. Ther. 101, 101 (1951) |
