Basic information
- Name:
Sodium sulfide
- CAS No.:
1313-82-2
- Molecular Structure:
- Formula:
- Na2S
- Molecular Weight:
- 78.04
- Deleted CAS:
- 113584-74-0
- Synonyms:
- Sodiumsulfide (Na2S);Disodiummonosulfide;Disodium sulfide;Disodium sulfide (Na2S);NSC 41874;Sodiummonosulfide;Sodium sulphide;
- EINECS:
- 215-211-5
- Density:
- 1.86 g/cm3
- Melting Point:
- 950 ºC
- Solubility:
- Water solubility: 186 g/L (20 ºC)
- Appearance:
- crystals of varied colour, with a repulsive odour
- Hazard Symbols:
C,
N- Risk Codes:
- 31-34-50
- Safety Description:
- 26-45-61 Details
- Transport Information:
- UN 1849 8/PG 2
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Chemistry
Molecular Formula: Na2S
Molecular Weight: 78.04 g/mol
EINECS: 215-212-0
Density: 1.86 g/mL at 25 °C(lit.)
Melting point: 213-217 °C(lit.)
Storage tempreture: Refrigerator (+4 °C)
Solubility: Insoluble in ether;slightly soluble in alcohol
Appearance: Crystals of varied colour, with a repulsive odour
Structure of Sodium sulfide (CAS NO.1313-82-2):
Product Category of Sodium sulfide (CAS NO.1313-82-2): Inorganics;Inorganic Chemicals;Catalysis and Inorganic Chemistry;Metal and Ceramic Science
Uses
Sodium sulfide (CAS NO.1313-82-2) is used in the manufacture of dyes and sulfide ore flotation agents, and is also used in the manufacture of depilatory cream, paper cooking agent,etc.
Production
Industrially Sodium sulfide (CAS NO.1313-82-2) is produced by reduction of Na2SO4 with carbon, in the form of coal:
Na2SO4 + 4 C → Na2S + 4 CO
In the laboratory, the anhydrous salt can be prepared by reduction of sulfur with sodium in anhydrous ammonia. Alternatively, sulfur can be reduced by sodium in dry THF with a catalytic amount of naphthalene:
2 Na + S → Na2S
Toxicity Data With Reference
| 1. | orl-rat LD50:208 mg/kg | GTPZAB Gigiena Truda i Professionalnye Zabolevaniia. Labor Hygiene and Occupational Diseases. 30 (8)(1986),30. | ||
| 2. | ipr-rat LD50:147 mg/kg | GTPZAB Gigiena Truda i Professionalnye Zabolevaniia. Labor Hygiene and Occupational Diseases. 30 (8)(1986),30. | ||
| 3. | orl-mus LD50:205 mg/kg | GTPZAB Gigiena Truda i Professionalnye Zabolevaniia. Labor Hygiene and Occupational Diseases. 30 (8)(1986),30. |
Consensus Reports
Reported in EPA TSCA Inventory.
Safety Profile
A poison by ingestion and intraperitoneal routes. Flammable when exposed to heat or flame. Unstable and can explode on rapid heating or percussion. Reacts violently with carbon, diazonium salts, n,n-dichloromethylamine, o-nitroaniline diazonium salt, water. When heated to decomposition it emits toxic fumes of SOx and Na2O. See also SULFIDES.
Hazard Codes: 
C,
N
Risk Statements: 31-34-50
R31 :Contact with acids liberates toxic gas.
R34:Causes burns.
R50:Very toxic to aquatic organisms.
Safety Statements: 26-45-61
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.)
S61:Avoid release to the environment. Refer to special instructions / safety data sheets.
Standards and Recommendations
DOT Classification: 4.2; Label: Spontaneously Combustible
Specification
Sodium sulfide , its cas register number is 1313-82-2. It also can be called Sodium bichromate ; and Disodium monosulfide .