Question 1: What is sodium bisulfite? Sodium bisulfite, white crystalline powder. It smells of sulfur dioxide and has an unpleasant taste. When exposed to air, some sulfur dioxide is lost and oxidized to sulfate. Soluble in 3.5 parts of cold water, 2 parts of boiling water and about 70 parts of ethanol, its aqueous solution is acidic.

Question 2: What is the common name of sodium bisulfite? Chinese alias: acid sodium sulfite, sodium bisulfite

Question 3: What is the difference between sodium bisulfate and sodium bisulfite? Sodium bisulfite Part I: Chemical name

Chemical Chinese name: sodium bisulfite

English name of chemical: soda bisulfite

English name 2: Sodium sulfite

English name 2: hydrogen sulfide sodium

Technical specification code: 2909

CAS No.： 763 1-90-5

Molecular formula: NaHSO3

Molecular weight: 104.06

Part II: Composition/Composition Information

Content of harmful substances, CAS No

Sodium bisulfite ≥99.5% 763 1-90-5

The third part: risk overview.

Hazard category:

Invasion route:

Health hazard: it is toxic to skin, eyes and respiratory tract, and may cause allergic reaction. Can cause corneal damage, leading to blindness. Can cause asthma; It causes nausea, abdominal pain, diarrhea, circulatory failure and central nervous system depression when taken orally in large quantities.

Environmental hazard: it is harmful to the environment and can pollute the water body.

Danger of explosion: this product is nonflammable, corrosive and can cause human body burns.

Part IV: First aid measures

Skin contact: Take off contaminated clothes immediately and rinse with plenty of flowing water. See a doctor.

Eye contact: lift the eyelid immediately and rinse it thoroughly with plenty of flowing water or normal saline for at least 15 minutes. See a doctor.

Inhalation: leave the site quickly and go to fresh air. Keep the respiratory tract unobstructed. If breathing is difficult, give oxygen. If breathing stops, give artificial respiration immediately. See a doctor.

Ingestion: Drink enough warm water to induce vomiting. See a doctor.

Part V: Fire Prevention Measures

Hazard characteristics: strong reducibility. Contact with acid or acid gas can produce toxic gas. Decompose by high heat and release toxic gases. It is corrosive.

Harmful combustion products: sulfur oxide and sodium oxide.

Fire extinguishing method: Firefighters must wear full-body acid and alkali resistant fire clothes. When putting out the fire, move the container from the fire to the open space as much as possible. Then choose the appropriate fire extinguishing agent according to the fire cause.

Part VI: Emergency Treatment of Leakage

Emergency treatment: isolate the leaked contaminated area and restrict access. It is recommended that emergency personnel wear dust masks and acid-proof clothes. Don't touch the leakage directly. Small amount of leakage: avoid dust, carefully sweep it up and collect it in a dry, clean and covered container. Large amount of leakage: collected and recycled or transported to waste disposal sites for disposal.

Part VII: Operation, Disposal and Storage

Precautions for operation: closed operation, local exhaust. Prevent dust from being released into the air of the workshop. Operators must be specially trained and strictly abide by the operating procedures. It is recommended that the operator wear a self-priming filter dust mask, chemical safety glasses, rubber acid and alkali resistant clothes and rubber acid alkali resistant gloves. Avoid producing dust. Avoid contact with oxidants, acids and alkalis. Equipped with leakage emergency treatment equipment. Empty containers may leave harmful substances.

Precautions for storage: Store in a cool and ventilated warehouse. Stay away from fire and heat sources. Protect from direct sunlight. The package is sealed. It should be stored separately from oxidants, acids and alkalis, and should not be mixed. It should not be stored for a long time to avoid deterioration. The storage area should be equipped with suitable materials to contain the leakage.

Part VIII: Contact Control/Personal Protection

occupational exposure limits

China MAC(mg/m3): No standard has been established.

Former Soviet Union MAC(mg/m3): No standard has been formulated.

TLVTN： 5mg/m3

TLVWN: No standard has been established.

Monitoring method:

Engineering control: closed operation, local exhaust.

Respiratory system protection: when the dust concentration in the air exceeds the standard, you must wear a self-priming filter dust mask. Air respirator should be worn during emergency rescue or evacuation.

Eye protection: Wear chemical safety glasses.

Physical protection: wear rubber acid and alkali resistant clothes.

Hand protection: Wear rubber acid alkali resistant gloves.

Other protection: Smoking, eating and drinking are prohibited in the workplace, and hands should be washed before meals. After work, take a shower and change clothes. Maintain good hygiene habits.

Part IX: Physical and chemical characteristics

Main ingredients: content: industrial grade ≥99.5%.

Appearance and properties: white crystalline powder with the smell of sulfur dioxide.

pH：

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Question 4: What is the acidity of sodium bisulfite? Although sulfite is a weak acid, the degree of ionization of bisulfite in aqueous solution is greater than that of hydrolysis, showing acidity.

Question 5: What is the acidity of sodium bisulfite?

Its aqueous solution is acidic.

Question 6: What does sodium bisulfite identify? Sodium bisulfite reacts with active aldehydes and ketones to form sodium bisulfite adducts.