3D Mol Similar

Sodium bisulfite

: Iupac Name：sodium;hydrogen sulfite; CAS No.: 7631-90-5; Molecular Weight：104.055; Modify Date.: 2022-11-12 07:35; Introduction:
Sodium bisulfite (CAS 7631-90-5) is a compound with the chemical formula NaHSO3. It is a white crystalline solid that is soluble in water. Sodium bisulfite is commonly used as a reducing agent and antioxidant in various industries, including food and beverage, pharmaceutical, and water treatment. It is also used as a preservative in some products. Sodium bisulfite is known for its ability to react with and remove chlorine and other oxidizing agents. It is often used to dechlorinate water and to prevent oxidation in certain processes. Additionally, sodium bisulfite has applications in the textile industry, where it is used as a bleaching agent and for the removal of excess dye. Overall, sodium bisulfite is a versatile compound with important uses in various fields.
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1. Names and Identifiers

: 1.1 Name; Sodium bisulfite; 1.2 Synonyms; EINECS 231-673-0 MFCD00003530 SODIUM ACID SULFITE Sodium bisulfite (JP15) SODIUM BISULPHITE SODIUM DISULFITE SODIUM HYDROGEN SULFITE Sodium hydrogen sulfite (1:1:1) SODIUM HYDROGEN SULPHITE SODIUM METABISULPHITE sodium,hydrogen sulfite SULFUROUS ACID MONOSODIUM SALT Sulfurous acid, sodium salt Sulfurous acid, sodium salt (1:2); View all

1.3 CAS No.: 7631-90-5

1.4 CID: 23665763

1.5 EINECS(EC#): 231-548-0

1.6 Molecular Formula: HNaO3S (isomer)

1.7 Inchi: InChI=1S/Na.H2O3S/c;1-4(2)3/h;(H2,1,2,3)/q+1;/p-1

1.8 InChIkey: DWAQJAXMDSEUJJ-UHFFFAOYSA-M

1.9 Canonical Smiles: OS(=O)[O-].[Na+]

1.10 Isomers Smiles: OS(=O)[O-].[Na+]

2. Properties

2.1 Density: 1.48

2.1 Melting point: 150℃

2.1 Boiling point: Decomposes (NIOSH, 2016)

2.1 Refractive index: 1.43 - 1.47

2.1 Precise Quality: 103.95400

2.1 PSA: 79.57000

2.1 logP: 0.20420

2.1 Solubility: 300 g/L

2.2 AnalyticLaboratory Methods: GAS-LIQUID CHROMATOGRAPHIC DETERMINATION OF SODIUM BISULFITE; IN COMPLEX MATRICES.

2.3 Appearance: Powder/Solid

2.4 AutoIgnition: Not flammable (USCG, 1999)

2.5 Chemical Properties: white monoclinic crystal; sulfur dioxide odor; soluble in water, slightly soluble in alcohol.

2.6 Color/Form: White

2.7 Contact Allergens: Sodium bisulfite is mainly used as an antioxidant in pharmaceutical products, as a disinfectant or bleach, and in the dye industry. The bisulfite of commerce consists chiefly of metabisulfite and possesses the same properties as the true bisulfite. So, the allergen to be tested in products containing disulfite is the corresponding metabisulfite.

2.8 Decomposition: Emits toxic fumes of oxides of sulfur & sodium monoxide; when heated to decomposition.

2.9 Odor: Slight odor of sulfur dioxide

2.10 PH: Aq soln is acid

2.11 Physical: SODIUM BISULFITE; is a white crystals or crystalline powder. Slight sulfurous odor. Specific gravity 1.48. Strong irritant to skin and tissue.

2.12 Water Solubility: 300 g/L

2.13 Spectral Properties: INDEX OF REFRACTION: 1.526

2.14 Stability: Stable. Incompatible with strong oxidizing agents, strong acids.

2.15 StorageTemp: Store at RT.

3. Use and Manufacturing

3.1 General Description: Also known as sodium acid sulfite or sodium hydrogen sulfite, NaHS03 is white crystals or crystalline powder that has a slight sulfurous odor and taste.Specific gravity 1.48. Strong irritant to skin and tissue. It is soluble in water,insoluble in alcohol,unstable in air,and non-combustible. Derived by saturating sodium carbonate solution with sulfur dioxide and the solution crystallized. Used as a chemical(sodium salts, cream of tartar), in vat dye preparation, textiles (antichlor, mordant, discharge), food preservative, bleaching groundwood, wool,etc., reducing agent, fermentation, antiseptic, cask sterilization (brewing), copper and brass plating,color preservative for pale crepe rubber, wood pulp digestion, analytical reagent,and as a dietary supplement.

3.2 GHS Classification: Signal: Warning
GHS Hazard Statements
H302: Harmful if swallowed [Warning Acute toxicity, oral]

Precautionary Statement Codes
P264, P270, P301+P312, P330, and P501

3.3 Methods of Manufacturing: CHIEFLY AS A BY-PRODUCT IN THE PRODUCTION OF PHENOL; & RESORCINOL;.

3.4 Potential Exposure: Sodium bisulfite is used in the digestion of wood pulp, in the tanning of leather; in the dyeing of textiles; as a photographic reducing agent; as a food preservative; as an additive in electroplating; as disinfectant, bleach, antioxidant, and as inhibitor of yeast and bacteria in winemaking.

3.5 Purification Methods: Crystallise it from hot H2O (1mL/g). Dry it at 100o under vacuum for 4hours.

3.6 Shipping: UN2693 Bisulfites, inorganic, aqueous solutions, n.o.s., Hazard class: 8; Labels: 8-Corrosive material. UN3260 Bisulfites, inorganic, solid, n.o.s., Hazard class: 8; Labels: 8-Corrosive material.

3.7 Usage: 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 inhibitors5. Used as reducing agent, antiseptic, disinfectant and bleach.; View all

3.8 Waste Disposal: Dump into water, add soda ash, then neutralize with HCl; flush to sewer with large volumes of water. Sodium bisulfite Preparation Products And Raw materials Raw materials

4. Safety and Handling

4.1 Symbol: GHS05, GHS07

4.1 Hazard Codes: Xn

4.1 Signal Word: Danger

4.1 Risk Statements: R22;R31

4.1 Safety Statements: S25;S46

4.1 Exposure Standards and Regulations: Sodium bisulfite is generally recognized as safe when used as a chemical preservative in accordance with good manufacturing practice, except that it is not used in meats; in food recognized as a source of vitamin B1; on fruits or vegetables intended to be served raw to consumers or sold raw to consumers, or to be presented to the consumer as fresh.
Sodium bisulfite is generally recognized as safe when used as a chemical preservative in accordance with good manufacturing or feeding practice, except that it is not used in meats or in food recognized as source of vitamin B1.

4.2 Packing Group: III

4.2 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.

4.3 Other Preventative Measures: SRP: The scientific literature for the use of contact lenses in industry is conflicting. The benefit or detrimental effects of wearing contact lenses depend not only upon the substance, but also on factors including the form of the substance, characteristics and duration of the exposure, the uses of other eye protection equipment, and the hygiene of the lenses. However, there may be individual substances whose irritating or corrosive properties are such that the wearing of contact lenses would be harmful to the eye. In those specific cases, contact lenses should not be worn. In any event, the usual eye protection equipment should be worn even when contact lenses are in place.

4.4 Hazard Declaration: H302-H318

4.4 DisposalMethods: SRP: At the time of review, criteria for land treatment or burial (sanitary landfill) disposal practices are subject to significant revision. Prior to implementing land disposal of waste residue (including waste sludge), consult with environmental regulatory agencies for guidance on acceptable disposal practices.

4.5 DOT Emergency Guidelines: /GUIDE 154: SUBSTANCES - TOXIC AND/OR CORROSIVE (NON-COMBUSTIBLE)/ Health: TOXIC; inhalation, ingestion, or skin contact with material may cause severe injury or death. Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution. /Bisulfites, aqueous solution, NOS; Bisulfites, inorganic, aqueous solution, NOS/
/GUIDE 154: SUBSTANCES - TOXIC AND/OR CORROSIVE (NON-COMBUSTIBLE)/ Fire or Explosion: Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Some are oxidizers and may ignite combustibles (wood, paper, oil, clothing, etc.). Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated. /Bisulfites, aqueous solution, NOS; Bisulfites, inorganic, aqueous solution, NOS/
/GUIDE 154: SUBSTANCES - TOXIC AND/OR CORROSIVE (NON-COMBUSTIBLE)/ Public Safety: CALL Emergency Response Telephone Number ... . As an immediate precautionary measure, isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters (75 feet) for solids. Keep unauthorized personnel away. Stay upwind. Keep out of low areas. Ventilate enclosed areas. /Bisulfites, aqueous solution, NOS; Bisulfites, inorganic, aqueous solution, NOS/
/GUIDE 154: SUBSTANCES - TOXIC AND/OR CORROSIVE (NON-COMBUSTIBLE)/ Protective Clothing: Wear positive pressure self-contained breathing apparatus (SCBA). Wear chemical protective clothing that is specifically recommended by the manufacturer. It may provide little or no thermal protection. Structural firefighters' protective clothing provides limited protection in fire situations ONLY; it is not effective in spill situations where direct contact with the substance is possible. /Bisulfites, aqueous solution, NOS; Bisulfites, inorganic, aqueous solution, NOS/
/GUIDE 154: SUBSTANCES - TOXIC AND/OR CORROSIVE (NON-COMBUSTIBLE)/ Evacuation: ... Fire: If tank, rail car or tank truck is involved in a fire, ISOLATE for 800 meters (1/2 mile) in all directions; also, consider initial evacuation for 800 meters (1/2 mile) in all directions. /Bisulfites, aqueous solution, NOS; Bisulfites, inorganic, aqueous solution, NOS/
/GUIDE 154: SUBSTANCES - TOXIC AND/OR CORROSIVE (NON-COMBUSTIBLE)/ Fire: Small fires: Dry chemical, CO2 or water spray. Large fires: Dry chemical, CO2, alcohol-resistant foam or water spray. Move containers from fire area if you can do it without risk. Dike fire control water for later disposal; do not scatter the material. Fire involving tanks or car/trailer loads: Fight fire from maximum distance or use unmanned hose holders or monitor nozzles. Do not get water inside containers. Cool containers with flooding quantities of water until well after fire is out. Withdraw immediately in case of rising sound from venting safety devices or discoloration of tank. ALWAYS stay away from tanks engulfed in fire. /Bisulfites, aqueous solution, NOS; Bisulfites, inorganic, aqueous solution, NOS/
/GUIDE 154: SUBSTANCES - TOXIC AND/OR CORROSIVE (NON-COMBUSTIBLE)/ Spill or Leak: ELIMINATE all ignition sources (no smoking, flares, sparks or flames in immediate area). Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. Prevent entry into waterways, sewers, basements or confined areas. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. DO NOT GET WATER INSIDE CONTAINERS. /Bisulfites, aqueous solution, NOS; Bisulfites, inorganic, aqueous solution, NOS/
/GUIDE 154: SUBSTANCES - TOXIC AND/OR CORROSIVE (NON-COMBUSTIBLE)/ First Aid: Move victim to fresh air. Call 911 or emergency medical service. Give artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; give artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult. Remove and isolate contaminated clothing and shoes. In case of contact with substance, immediately flush skin or eyes with running water for at least 20 minutes. For minor skin contact, avoid spreading material on unaffected skin. Keep victim warm and quiet. Effects of exposure (inhalation, ingestion or skin contact) to substance may be delayed. Ensure that medical personnel are aware of the material(s) involved and take precautions to protect themselves. /Bisulfites, aqueous solution, NOS; Bisulfites, inorganic, aqueous solution, NOS/; View all

4.6 RIDADR: UN 2693

4.6 Safety Profile: Poison by intravenous and intraperitoneal routes. Moderately toxic by ingestion. A corrosive irritant to skin, eyes, and mucous membranes. Mutation data reported. An allergen. When heated to decomposition it emits toxic fumes of SO, and Na2O. See also SULFUROUS ACID and SULFITES

4.7 Caution Statement: P280-P301 + P312 + P330-P305 + P351 + P338 + P310

4.7 Formulations/Preparations: USEPA/OPP Pesticide Code 078201; Trade Names: FR-62.
Grades: crystals; pure dry; commercial dry; reagent; commercial soln 35 deg be; powder (67% sulfur dioxide); CP /chemically pure: a grade designation signifying a minimum of impurities, but not 100% purity/; USP /United States pharmacopeia/; FCC /food chemicals codex/.
/Available as/ 38% & 43% solutions; technical, food, photo, reagent and anhydrous grades.
/SODIUM/ BISULFITE OF COMMERCE CONSISTS CHIEFLY OF SODIUM METABISULFITE.

4.8 Incompatibilities: Aqueous solution is a weak acid. Incompatible with strong mineral acids forming a toxic sulfur dioxide gas. A strong reducing agent, sodium bisulfite is incompatible with oxidizers, such as perchlorates, peroxides, permanganates, chlorates, and nitrates. Reacts with bases forming sulfate. Slowly oxidizes to sulfate in air. Heat causes decomposition. Slowly oxidized to the sulfate on exposure to air. Contact with oxidizers or acids forms sulfur dioxide gas. Attacks some metals in the presence of moisture.

4.9 WGK Germany: 1

4.9 RTECS: UX8225000

4.9 Protective Equipment and Clothing: Concentrated solutions are irritating to skin, mucous membranes.
It is irritating to the eyes, skin, & mucous membranes.

4.10 Reactivities and Incompatibilities: BISULFITE OF COMMERCE CONSISTS CHIEFLY OF SODIUM METABISULFITE, INCOMPATIBLE WITH ACIDS, OXIDIZERS.
Heat (decomposes) (Note: Slowly oxidized to the sulfate on exposure to air).

4.11 Report: SODIUM BISULFITE? is reported in EPA TSCA Inventory. EPA Genetic Toxicology Program.

4.12 Skin, Eye, and Respiratory Irritations: Concentrated solutions are irritating to skin, mucous membranes.
It is irritating to the eyes, skin, & mucous membranes.

4.13 Safety: Poison by intravenous and intraperitoneal routes. Moderately toxic by ingestion. A corrosive irritant to skin, eyes, and mucous membranes. Mutation data reported. An allergen. When heated to decomposition it emits toxic fumes of SO_x and Na₂O. See also SULFUROUS ACID and SULFITES.
Hazard Codes:?Xn
Risk Statements: 22-31-41?
R22:Harmful if swallowed.?
R31 :Contact with acids liberates toxic gas.?
R41:Risk of serious damage to the eyes.
Safety Statements: 26-39-46-25
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.
RIDADR: UN 2693
WGK Germany: 1
RTECS: UX8225000
Hazardous Substances Data: 7631-90-5(Hazardous Substances Data); View all

4.14 Specification: ??Sulfurousacid, sodium salt (1:1) ,?its cas register number is 7631-90-5. It also can be called?AI3-08582 ; Bisulfite de sodium?;?EPA Pesticide Chemical Code 078201 ; Hydrogen sodium sulfite ; Hydrogen sulfite sodium ; Monosodium sulfite ;
?Sodium acid sulfite ; Sodium bisulfite ; Sodium bisulphite ; Sodium hydrogen sulfite ; Sodium hydrosulfite(DOT) ; Sodium metabisulfite ; Sodium sulfite (NaHSO3) ; Sodium sulhydrate ; Sulfurous acid, monosodium salt . Sulfurousacid, sodium salt (1:1) (CAS NO.7631-90-5) is a?white powder.

4.15 Toxicity

1.	???	mmo-sat 1?mmol/L	???	TCMUD8 ?? Teratogenesis, Carcinogenesis, and Mutagenesis. 5 (1985),195.
2.	???	mmo-hmi 200?mmol/L ABMPAC 17,115,80
3.	???	orl-rat LD50:2?g/kg	???	85INA8 ?? Documentation of the Threshold Limit Values and Biological Exposure Indices. 6 (1991),1408.
4.	???	ipr-rat LD50:475?mg/kg	???	PNASA6 ?? Proceedings of the National Academy of Sciences of the United States of America. 70 (1973),3655.
5.	???	ivn-rat LD50:115?mg/kg	???	JPETAB ?? Journal of Pharmacology and Experimental Therapeutics. 101 (1951),101.
6.	???	ipr-mus LD50:675?mg/kg	???	CLPTAT ?? Clinical Pharmacology and Therapeutics. 9 (1968),328.
7.	???	ivn-mus LD50:130?mg/kg	???	JPETAB ?? Journal of Pharmacology and Experimental Therapeutics. 101 (1951),101.
8.	???	ipr-dog LD50:244?mg/kg	???	CLPTAT ?? Clinical Pharmacology and Therapeutics. 9 (1968),328.
9.	???	ipr-rbt LD50:300?mg/kg	???	CLPTAT ?? Clinical Pharmacology and Therapeutics. 9 (1968),328.
10.	???	ivn-rbt LD50:65?mg/kg	???	JPETAB ?? Journal of Pharmacology and Experimental Therapeutics. 101 (1951),101.

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5. MSDS

2.Hazard identification

2.1 Classification of the substance or mixture

Acute toxicity - Oral, Category 4

2.2 GHS label elements, including precautionary statements

Pictogram(s)
Signal word	Warning
Hazard statement(s)	H302 Harmful if swallowed
Precautionary statement(s)
Prevention	P264 Wash ... thoroughly after handling. P270 Do not eat, drink or smoke when using this product.
Response	P301+P312 IF SWALLOWED: Call a POISON CENTER/doctor/\u2026if you feel unwell. P330 Rinse mouth.
Storage	none
Disposal	P501 Dispose of contents/container to ...

2.3 Other hazards which do not result in classification

none

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6. NMR Spectrum

IR : nujol mull

7. Other Information

7.0 Merck: 13,8660

7.1 Chemical properties: white monoclinic crystal; sulfur dioxide odor; soluble in water, slightly soluble in alcohol.

7.2 Uses: 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.; View all

7.3 Identification test: Both sodium salt test (IT-28) and sulfite test (IT-30) are positive.

7.4 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).

7.5 Toxicity: 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).

7.6 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.; View all

7.7 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↑
NaSO3+H2O→2NaHSO3
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↑

7.8 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

7.9 Chemical Properties: Sodium bisulfite is a white crystalline solid. Slight odor of sulfur dioxide and a disagreeable taste. Slowly oxidized to the sulfate on exposure to air

7.10 Chemical Properties: white powder

7.11 Uses: Reducing agent; convenient source of sulfur dioxide.

7.12 Uses: As disinfectant and bleach, particularly for wool; in dyeing for preparing hot and cold indigo vats; in paper-making in place of sodium hyposulfite to remove Cl from bleached fibers; as stripper (reducer) in laundering; to remove permanganate stains from skin and clothing; to render certain dyes sol; manufacture of sodium hydrosulfite; coagulating rubber latex; as preservative for deteriorative liqs or solutions used for technical purposes; as antiseptic in fermentation industries. As preservative and bleach in food. Pharmaceutic aid (antioxidant).

7.13 Uses: sodium bisulfite is a preservative and anti-oxidant, it is most frequently used as a pH adjuster.

7.14 Uses: Sodium Bisulfite is a preservative that exists as a powder, with a solubility of 1 g in 4 ml of water. it prevents discoloration and inhib- its bacterial growth. it is used in dried fruit to inhibit browning and maintain the bright color. it is found in reconstituted lemon juice. see sulfur dioxide.

7.15 General Description: Also known as sodium acid sulfite or sodium hydrogen sulfite, NaHS03 is white crystals or crystalline powder that has a slight sulfurous odor and taste.Specific gravity 1.48. Strong irritant to skin and tissue. It is soluble in water,insoluble in alcohol,unstable in air,and non-combustible. Derived by saturating sodium carbonate solution with sulfur dioxide and the solution crystallized. Used as a chemical(sodium salts, cream of tartar), in vat dye preparation, textiles (antichlor, mordant, discharge), food preservative, bleaching groundwood, wool,etc., reducing agent, fermentation, antiseptic, cask sterilization (brewing), copper and brass plating,color preservative for pale crepe rubber, wood pulp digestion, analytical reagent,and as a dietary supplement.

7.16 Air & Water Reactions: Water soluble.

7.17 Reactivity Profile: Sodium bisulfite 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].

7.18 Hazard: Not permitted in meats and other sources of vitamin B 1 , strong irritant to skin and tissue.

7.19 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.

7.20 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.

7.21 Contact allergens: Sodium bisulfite is mainly used as an antioxidant in pharmaceutical products, as a disinfectant or bleach, and in the dye industry. The bisulfite of commerce consists chiefly of metabisulfite and possesses the same properties as the true bisulfite. So, the allergen to be tested in products containing disulfite is the corresponding metabisulfite.

7.22 Safety Profile: Poison by intravenous and intraperitoneal routes. Moderately toxic by ingestion. A corrosive irritant to skin, eyes, and mucous membranes. Mutation data reported. An allergen. When heated to decomposition it emits toxic fumes of SO, and Na2O. See also SULFUROUS ACID and SULFITES

7.23 Potential Exposure: Sodium bisulfite is used in the digestion of wood pulp, in the tanning of leather; in the dyeing of textiles; as a photographic reducing agent; as a food preservative; as an additive in electroplating; as disinfectant, bleach, antioxidant, and as inhibitor of yeast and bacteria in winemaking.

7.24 Shipping: UN2693 Bisulfites, inorganic, aqueous solutions, n.o.s., Hazard class: 8; Labels: 8-Corrosive material. UN3260 Bisulfites, inorganic, solid, n.o.s., Hazard class: 8; Labels: 8-Corrosive material.

7.25 Purification Methods: Crystallise it from hot H2O (1mL/g). Dry it at 100o under vacuum for 4hours.

7.26 Incompatibilities: Aqueous solution is a weak acid. Incompatible with strong mineral acids forming a toxic sulfur dioxide gas. A strong reducing agent, sodium bisulfite is incompatible with oxidizers, such as perchlorates, peroxides, permanganates, chlorates, and nitrates. Reacts with bases forming sulfate. Slowly oxidizes to sulfate in air. Heat causes decomposition. Slowly oxidized to the sulfate on exposure to air. Contact with oxidizers or acids forms sulfur dioxide gas. Attacks some metals in the presence of moisture.

7.27 Waste Disposal: Dump into water, add soda ash, then neutralize with HCl; flush to sewer with large volumes of water.

8. Computational chemical data

Molecular Weight: 104.055g/mol
Molecular Formula: HNaO₃S
Compound Is Canonicalized: True
XLogP3-AA: null
Exact Mass: 103.95440935
Monoisotopic Mass: 103.95440935
Complexity: 33.9
Rotatable Bond Count: 0
Hydrogen Bond Donor Count: 1
Hydrogen Bond Acceptor Count: 4
Topological Polar Surface Area: 79.6
Heavy Atom Count: 5
Defined Atom Stereocenter Count: 0
Undefined Atom Stereocenter Count: 0
Defined Bond Stereocenter Count: 0
Undefined Bond Stereocenter Count: 0
Isotope Atom Count: 0
Covalently-Bonded Unit Count: 2
CACTVS Substructure Key Fingerprint: AAADcQAAMCBAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACAAAAAAAAAAAAAAAAIAAAAAAACAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA==

9. Question & Answer

What are the uses and effects of Sodium bisulfite? May 30 2023
Sodium bisulfite, also known as acid sodium sulfite, is an inorganic compound with the chemical formula NaHSO3 and CAS number 7631-90-5. It is a white crystalline powder with an unpleasant odor of sul..
How to produce high-purity sodium bisulfite solution? Oct 23 2022
Background technology Sodium bisulfite solution can be used as a bleaching agent for cotton fabrics in the textile industry, a reducing agent in dyes, papermaking, tanning, chemical synthesis and othe..
Can Sodium Bisulfite Increase Crop Yield? Feb 15 2022
Sodium bisulfite is a green plant photorespiration inhibitor that works differently from fertilizers and plant growth hormones. While crops undergo photosynthesis, they also undergo photorespiration, ..
What is the reaction if the vapour of sodium bisulfite and hydrochloric acid both are reacted? Jan 16 2022
NaHSO3 + HCl → SO2 + NaCl + H2O - When dilute hydrochloric acid reacts with sodium bisulfite sulphur dioxide gas is evolved. It is a colourless gas having the suffocating smell of burning sulphur. Wh..

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Sodium Metabisulfite