Sodium Sulfite
CAS Number: 7757-83-7
Chemical Formula: Na2O3S
Synonyms:
Anhydroussodiumsulfite
Disodiumsulfite
Exsiccatedsodiumsulfite
Appearance: White to slightly yellow
HS Code:28321000
MOQ (Minimum Order Quantity): 1 FCL (Full Container Load)
Products Description of Sodium sulfite CAS#7757-83-7
Sodium sulfite (Na₂SO₃) is a soluble sodium salt of sulfurous acid. It has bleaching, desulfurizing, and dechlorinating properties, making it widely used in various fields.
Its bleaching effect makes it a key material in the pulp and papermaking industry. It also works well as an additive to keep certain products looking fresh. Additionally, it is an ingredient in many pharmaceuticals—helping maintain the effectiveness and stability of drugs. Beyond that, it is used in water treatment as an oxygen scavenger, and also finds applications in flue gas desulfurization and the preservation of 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) |
Product Application of Sodium sulfite CAS#7757-83-7
Sodium sulfite (CAS No. 7757-83-7) is an inorganic compound with reducibility and alkalinity, and its applications are widespread. In chemical and industrial fields, it has multiple uses: dechlorinating textiles after bleaching, aiding pulping and cooking in the paper industry, deaerating water during water treatment, treating chromium-containing wastewater, and removing hair and softening materials in the leather industry. In the food and beverage industry, it acts as a preservative, bleaching agent, and antioxidant for products like preserved fruits and fruit juices, and also helps regulate fermentation in the brewing process.
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