Sodium sulfite CAS#7757-83-7

CAS Number: 7757-83-7
Chemical Formula: Na2O3S
Synonyms:

sodiumsulfite(2:1)
natriumsulfurosum
natriumsulfid

Appearance: White Powder

MOQ (Minimum Order Quantity): 1 FCL (Full Container Load)

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Sodium sulfite CAS#7757-83-7

As a soluble sodium salt of sulfurous acid, Sodium sulfite (Na2SO3) shows blenching, de-sulfurizing and dechlorinating properties which is widely applied in various fields. It is primarily used in the pulp and papermaking industry due to its blenching activity. It can serve as a good additive to help preserve the fresh appearance of good products. Besides, sodium sulfite is a component in many pharmaceuticals, which is effective to maintain the potency and stability of drugs. It can also be applied for water treatment as an oxygen scavenger agent and applied in flue gas desulfurization and preservation of photo developer solutions, etc.

Sodium sulfite Chemical Properties

Melting point	500 °C
bulk density	1480kg/m3
density	2.63
refractive index	1,484
storage temp.	Store at +5°C to +30°C.
solubility	H2O: 1 M at 20 °C, clear, colorless
form	Solid
color	White to slightly yellow
Specific Gravity	2.633
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.
Cosmetics Ingredients Functions	REDUCING ANTIOXIDANT HAIR WAVING OR STRAIGHTENING
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,Na2S03, is a white,water-soluble, crystalline solid with a sulfurous, salty taste. It decomposes when heated. Sodium sulfite is used as a source of sulfite,as a chemical intermediate and food preservative, in medicine and paper manufacturing, in photographic developing, and as a bleaching agent in the textile industry. Most boiler operators use sodium sulfite for chemicals cavenging of oxygen in the feedwater. Because it decomposes into acidic gases at the high temperatures that accompany high pressures, sodium sulfite should not be used for this purpose at pressures above 122atm (12.4MPa,or 1.8 ksi).

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