Chinese Japanese Germany

Sodium sulfite

Description References
Sodium sulfite
Sodium sulfite
Chemical Name:
Sodium sulfite
s-wat;sulftech;SULPHITES;natriumsulfit;natriumsulfid;natriisulphis;Natriumsulfit8;Sodium sulfite;SODIUM SULPHITE;disodiumsulfite
Molecular Formula:
Formula Weight:
MOL File:

Sodium sulfite Properties

Melting point:
500 °C
refractive index 
storage temp. 
Store at RT.
H2O: 1 M at 20 °C, clear, colorless
White to slightly yellow
9.0-10.5 (25℃, 1M in H2O)
Water Solubility 
23 g/100 mL (20 ºC)
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)
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
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
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)
Signal word:
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H303 May be harmfulif swallowed Acute toxicity,oral Category 5 P312
Precautionary statements:

Sodium sulfite price More Price(23)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 1.06657 Sodium sulfite 7757-83-7 1EA $48.75 2017-11-08 Buy
Sigma-Aldrich 08981 Sodium sulfite analytical standard 7757-83-7 1g $50 2018-11-13 Buy
Strem Chemicals 93-1184 Sodium sulfite, anhydrous, 98+% (ACS) 7757-83-7 250g $18 2018-11-13 Buy
Strem Chemicals 93-1184 Sodium sulfite, anhydrous, 98+% (ACS) 7757-83-7 1kg $52 2018-11-13 Buy
Sigma-Aldrich 71988 Sodium sulfite BioUltra, anhydrous, ≥98% (RT) 7757-83-7 250g $59.7 2018-11-13 Buy

Sodium sulfite Chemical Properties,Uses,Production


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.


Chemical Properties

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).


ChEBI: An inorganic sodium salt having sulfite as the counterion.

General Description

White odorless powder. Density 2.633 g / cm3. Moderately toxic. Sinks in water and dissolves slowly. Also transported as a heptahydrate Na2SO3.7H2O.

Air & Water Reactions

Soluble in water. Reacts with hot water, steam or acids to produce corrosive material.

Reactivity Profile

Sodium sulfite is a reducing agent, particularly under basic conditions. Reacts with oxidizing agents such as peroxides, epoxides, oxoacids. Emits toxic fumes of sodium oxide and oxides of sulfur if heated to decomposition [Lewis, 3rd ed., 1993, p. 1174].

Health Hazard

When ingested, solutions cause gastric irritation by the liberation of sulfurous acid. Because of rapid oxidation to sulfate, sulfites are well tolerated until large doses are reached; then violent colic and diarrhea, circulatory disturbances, central nervous depression, and death can occur.

Fire Hazard

Literature sources indicate that Sodium sulfite is noncombustible.

Contact allergens

Sodium sulfite is mainly used in photographic developers, for fixing prints, bleaching textile fibers, as a reducer in manufacturing dyes, as a remover of Cl in bleached textiles and paper, and as a preservative in the food industry for meat, egg yolks, and so on.

Purification Methods

Crystallise the sulfite from warm water (0.5mL/g) by cooling to 0o. Also purify it by repeated crystallisation from deoxygenated water inside a glove-box, and finally drying it under vacuum. [Rhee & Dasgupta J Phys Chem 89 1799 1985.]

Sodium sulfite Preparation Products And Raw materials

Raw materials

Preparation Products

Sodium sulfite Suppliers

Global( 342)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Shenzhen Sendi Biotechnology Co.Ltd.
0755-23311925 18102838259
0755-23311925 CHINA 3218 55
Henan DaKen Chemical CO.,LTD.
+86-371-55531817 CHINA 22119 58
Henan Tianfu Chemical Co.,Ltd.
0371-55170693 CHINA 20795 55
Mainchem Co., Ltd.
+86-0592-6210733 CHINA 32764 55
Hefei TNJ Chemical Industry Co.,Ltd.
86-0551-65418684 18949823763
86-0551-65418684 China 1465 55
Shanghai TongYuan Chemical Co., Ltd. 021-69182866 69186366
021-69182022 China 5184 58
Shanghai Aladdin Bio-Chem Technology Co.,LTD 021-20337333/400-620-6333
021-50323701 China 25126 65
Rhawn Reagent 400-133-2688
021-57461626 China 13058 58
J & K SCIENTIFIC LTD. 400-666-7788 +86-10-82848833
+86-10-82849933; China 96815 76
Meryer (Shanghai) Chemical Technology Co., Ltd. +86-(0)21-61259100(Shanghai) +86-(0)755-86170099(ShenZhen) +86-(0)10-62670440(Beijing)
+86-(0)21-61259102(Shanghai) +86-(0)755-86170066(ShenZhen) +86-(0)10-88580358(Beijing) China 40399 62

7757-83-7(Sodium sulfite)Related Search:

Copyright 2017 © ChemicalBook. All rights reserved