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7631-90-5 Structure

7631-90-5 Structure

Sodium bisulfite


disulfurous acid disodium salt
Hydrogen sulfite sodium
monosodium sulfite
Pyrosulfurous acid disodium salt

[Molecular Formula]

[MDL Number]

[Molecular Weight]

[MOL File]

Chemical PropertiesBack Directory

white powder
[mp ]

150 °C
[density ]

[storage temp. ]

Store at RT.
[solubility ]

300 g/L

Stable. Incompatible with strong oxidizing agents, strong acids.
[Water Solubility ]

300 g/L
[Merck ]

[CAS DataBase Reference]

7631-90-5(CAS DataBase Reference)
[EPA Substance Registry System]

7631-90-5(EPA Substance)
Safety DataBack Directory
[Hazard Codes ]

[Risk Statements ]

R22:Harmful if swallowed.
R31:Contact with acids liberates toxic gas.
R41:Risk of serious damage to eyes.
[Safety Statements ]

S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S39:Wear eye/face protection .
S46:If swallowed, seek medical advice immediately and show this container or label .
S25:Avoid contact with eyes .

UN 2693
[WGK Germany ]


[Hazardous Substances Data]

7631-90-5(Hazardous Substances Data)
Raw materials And Preparation ProductsBack Directory
[Raw materials]

Sodium carbonate-->Sodium bicarbonate-->Sulfur-->Sodium sulfite-->Sulfur dioxide-->Sulphur-->Solvent
[Preparation Products]

3-Bromoindazole-->2-Methylquinoxaline-->2,3-DIHYDROBENZOFURAN-5-BORONIC ACID-->Benz[cd]indol-2(1H)-one-->Reactive Blue 104-->Kanamycin sulfate-->2-Methoxyphenylacetone-->Quinoxaline-->5-Hydroxyquinoline-->N,N'-Diphenylbenzidine-->4-Acetylbenzoic acid-->6-Iodoquinazolin-4-one-->6-BROMO-3-HYDROXYQUINOLINE-->Fast Blue BB-->Sodium formaldehyde bisulfite-->2-BROMO-4-NITROANILINE-->2-[(4-Aminophenyl)sulfonyl]ethyl hydrogen sulfate-->4-Chloromandelic acid-->2,4-DINITROBENZENESULFONIC ACID-->DL-Norephedrine hydrochloride-->PIPERITONE-->5-CHLORO-2-NITROANISOLE-->3,3'-Dihydroxybenzidine-->FUBERIDAZOLE-->Dichlorosulfophenyl-3-methylpyrazolone-->DL-Mandelic acid-->3-AMINOBENZALDEHYDE POLYMER-->Cyclopentyl Acetaldehyde-->N,N-Diethylcyanoacetamide-->N-(1-Naphthyl)ethylenediamine dihydrochloride-->1-CYANOCYCLOPENTENE-->3,3-Dimethylacrylic acid -->4-Iodoaniline-->1-Hydroxy-3-phenyl-1,3-propanedisulfonic acid disodium salt-->methylheptenone -->PHENYLHYDRAZINE DISODIUM SULFONATE-->4-METHOXY-2-NITROACETANILIDE-->Iodophor-->2,6-Dibromophenol-->Sodium [(2,3-dihydro-1,5-dimethyl-3-oxo-2-phenyl-1H-pyrazol-4-yl)methylamino]methanesulfonate
Hazard InformationBack Directory
[General Description]

White crystals or crystalline powder. Slight sulfurous odor. Specific gravity 1.48. Strong irritant to skin and tissue.
[Reactivity Profile]

SODIUM HYDROGEN SULFITE, [SOLID] is a reducing agent. Emits highly toxic gaseous sulfur dioxide gas when heated to decomposition or on contact with mineral acids [Sax, 9th ed., 1996, p. 2949].
[Air & Water Reactions]

Water soluble.
[Health Hazard]

Powder is irritating to eyes, nose, and throat and can irritate skin. Ingestion may cause irritation of stomach. Very large doses cause violent colic, diarrhea, depression, and death.
[Fire Hazard]

Flammable/combustible material. May ignite on contact with moist air or moisture. May burn rapidly with flare-burning effect. Some react vigorously or explosively on contact with water. Some may decompose explosively when heated or involved in a fire. May re-ignite after fire is extinguished. Runoff may create fire or explosion hazard. Containers may explode when heated.
Material Safety Data Sheet(MSDS)Back Directory
[msds information]

Sodium hydrogen sulfite(7631-90-5).msds
Questions And AnswerBack Directory
[Chemical properties]

white monoclinic crystal; sulfur dioxide odor; soluble in water, slightly soluble in alcohol.

1. Used as reducing agent, food preservatives and bleach.
2. Used for the bleaching of cotton fabric and organic substance. Used as reducing agents in dyes, paper, leather, chemical synthesis and other industries. Used for the production of analgin and aminopyrine intermediates in pharmaceutical industry. Used as bleach, preservatives, and antioxidants of food grade products.
3. Sodium bisulfite is reduction bleach allowed to use in China. It has bleaching effect on food and has a strong inhibitory effect on the oxidase within plant foods. It can be used for candied fruit, glucose, sugar, rock candy, caramel, candy, liquid glucose, dried fruit, dried vegetables, vermicelli, bamboo shoots, mushrooms and mushroom cans in provisions of our country, with a maximum use of 0.45g/kg; it can also be used for potato starch with a maximum use amount of 0.2g/kg and a maximume residual amount (in terms of SO2) of less than 0.03 g/kg.
4. Used as reductants in analysis and also as bleach and bacterial inhibitors
5. Used as reducing agent, antiseptic, disinfectant and bleach.
[Identification test]

Both sodium salt test (IT-28) and sulfite test (IT-30) are positive.
[Content Analysis]

Transfer 50ml of 0.1mol/L iodine solution into a flask with a stopper, and then add 200mg of accurately weighed sample and plug. After placed 5min, add 1ml of hydrochloric acid, and plus starch test solution (TS-235) as an indicator. Titrate the excess iodine with 0.1 mol/L sodium thiosulfate. Each mI of 0.1mol/L iodine solution is equivalent to 3.203mg of sulfur dioxide (SO2).

ADI 0~0.7mg/kg (in SO2; including SO2 and sulfites; FAO / WHO, 2001).
LD50 115 mg / k (rat, oral).
GRAS (FDA, § 182.3739, 2000).
[Usage limits]

GB 2760-2001 (g / kg): candied fruit, dried fruits, dried vegetables, vermicelli, glucose, sugar, rock candy, caramel, candy, liquid glucose and cans of bamboo shoots, mushrooms and mushrooms 0.45; potato starch 0.20 (Residue≤0.03); fresh glucose (tablet gasification process, in sulfite) 2.4 (residual amount calculated in SO2≤0.05, tablet packaging shall give clear indication of indicate edible)
FAO/WHO(1984): frozen shrimp, prawns, lobsters (raw product) 100mg/kg, (cooked products) 30mg/kg(in SO2); frozen french fried potatoes 50mg/kg (in SO2); pineapple juice with anti-corrosion 500 mg / kg of (in SO2; only for manufacture).
Maximum residue levels (in SO2) of Japanese provisions: dried apricots, dried peaches 2g/kg; gelatin 0.5g / kg; molasses, corn syrup 0.3g / kg; fruit wine 0.35g / kg; shrimp 0.1mg / kg.
When applied to dry fruit, sodium bisulfite can be prepared into 0.2% to 3% solution to take dipping or spraying.
FDA, § 182.3739 (2000): shall not be used for meat, vitamin B and source food.
EEC (1990): mainly for the preservation of alcoholic beverages.
[Production method]

Add sodium sulphite mother liquor (containing NaHSO3 40%, Ph value of 3 to 4) slowly into soda ash to generate sodium sulfite solution (to the slurry Ph value of 7~8 for the end); transfer the above sodium sulfite solution into series reactors (2 to 3) to absorb the SO2 gas (10% to 13%) from the combustion of sulfur, forming sodium bisulfite (to the reaction temperature no longer rising for the end). In the reaction process, a large number of crystals precipitate out, which is centrifuged to obtain the wet goods with moisture content of 6% to 10%, and then dehydrated by air drying at 250 to 300 ° C to make the final products.
2NaHSO3 + Na2CO3 → 2Na2SO3 + H2O + CO2↑

Absorb sulfur dioxide from the gas of sulfuric acid production with soda ash solution to generate sodium bisulfite. After further centrifugal separation and air drying at 250 ~ 300 ° C, the final sodium bisulfite is obtained.
Na2CO3 + 2SO2 + H2O → 2NaHSO3 + CO2↑
[Hazards & Safety Information]

Category: Corrosive items
Toxicity classification: moderate toxicity
Acute Toxicity: Oral-Rat LD50: 2000 mg/kg; Abdominal-Mouse LD50: 675 mg/kg
Flammable hazardous characteristics :
The products can decompose into sulfur oxides when meeting heat;
Aqueous solution is alkaline and corrosive.
Storage and transportation characteristics :
Storehouse should be low-temperature, well-ventilated and dry.
Fire extinguishing agent: much water
Occupational Standard: TWA 5mg /m3; TWA 5 mg/m3
Spectrum DetailBack Directory
[Spectrum Detail]

Sodium bisulfite(7631-90-5)IR1
Well-known Reagent Company Product InformationBack Directory
[Acros Organics]

Sodium bisulfite, for analysis ACS(7631-90-5)
[Sigma Aldrich]

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