Sodium sulfide
- CAS No.
- 1313-82-2
- Chemical Name:
- Sodium sulfide
- Synonyms
- SODIUM SULPHIDE;Disodium sulfide;sodiumsulfuret;disodium sulphide;sodiumsulfide(na2s);Sodium sulfide solid;sodiumsulfide(anhydrous);sodiumsulphide,anhydrous;sodiumsulfide(non-specificname);Na2-S
- CBNumber:
- CB3429046
- Molecular Formula:
- Na2S
- Molecular Weight:
- 78.04
- MOL File:
- 1313-82-2.mol
- Modify Date:
- 2023/12/28 15:08:22
| Melting point | 950 °C(lit.) |
|---|---|
| Density | 1.86 g/mL at 25 °C(lit.) |
| storage temp. | Refrigerator (+4°C) |
| solubility | H2O: 0.1 g/mL, clear, colorless |
| form | flakes |
| Specific Gravity | 1.856 |
| color | Yellow |
| Water Solubility | 186 g/L (20 ºC) |
| Sensitive | Hygroscopic |
| Merck | 14,8681 |
| Dielectric constant | 5.0（Ambient） |
| Stability | Spontaneously flammable. Incompatible with acids, metals, oxidizing agents. Contact with acid liberates toxic gas. Fine dust/air mixtures are explosive. Hygroscopic. |
| InChIKey | CXPWOVUZRAFMDA-UHFFFAOYSA-N |
| CAS DataBase Reference | 1313-82-2(CAS DataBase Reference) |
| NIST Chemistry Reference | Sodium sulfide(1313-82-2) |
| EPA Substance Registry System | Sodium sulfide (1313-82-2) |
SAFETY
Risk and Safety Statements
| Symbol(GHS) |     GHS02,GHS05,GHS06,GHS09 |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Signal word | Danger | |||||||||
| Hazard statements | H251-H290-H301+H311-H314-H400 | |||||||||
| Precautionary statements | P235-P260-P280-P303+P361+P353-P304+P340+P310-P305+P351+P338 | |||||||||
| Hazard Codes | C,N,Xn | |||||||||
| Risk Statements | 31-34-50-22 | |||||||||
| Safety Statements | 26-45-61-36/37/39 | |||||||||
| RIDADR | UN 1849 8/PG 2 | |||||||||
| WGK Germany | 2 | |||||||||
| RTECS | WE1905000 | |||||||||
| F | 3-8-9-23 | |||||||||
| TSCA | Yes | |||||||||
| HazardClass | 4.2 | |||||||||
| PackingGroup | II | |||||||||
| HS Code | 28301010 | |||||||||
| NFPA 704 |
|
Sodium sulfide Chemical Properties,Uses,Production
Chemical Properties
Sodium sulfide,Na2S, also known as sodium sulfuret,is an irritating, water-soluble, yellowish to reddish, deliquescent powder that melts at 1180°C (2156 °F). Sodium sulfide is used as a chemical intermediate and solvent,in conversion of wood into paper pulp, as a photographic and analytical reagent,as a source of sulfide,as a reducing agent,in organic reactions, as a depilatory, and in sheep dips.
Physical properties
White cubic crystal; hygroscopic; density 1.856 g/cm3; melts at 1,172°C; soluble in water 18.6 g/100mL at 20°C and 39 g/100mL at 50°C; aqueous solutions strongly alkaline; slightly soluble in alcohol; insoluble in ether.
The pentahydrate consists of flat, shiny prismatic crystals; density 1.58 g/cm3; loses three water molecules at 100°C; melts at 120°C losing all water molecules; soluble in water and alcohol; aqueous solutions strongly alkaline; insoluble in ether.
The nonahydrate is a yellowish-white crystalline solid; tetragonal crystals; odor of hydrogen sulfide; the color changes on exposure to light and air, first turning to yellow and then becoming brownish-black, deliquescent; density 1.43 g/cm3; decomposes at about 50°C; very soluble in water; aqueous solution strongly alkaline; slightly soluble in alcohol; insoluble in ether.
Uses
These yellow flakes were made by fusing sodium carbonate with sulfur. Soluble in water but less so in alcohol, sodium sulfide was lovingly called “stink” by those who used it for toning prints or intensifying negatives because of its sulfurous smell.
Preparation
Sodium sulfide is prepared by heating sodium bisulfate with sodium chloride and coal above 950°C. The product mixture is extracted with water and the hydrated sulfide is obtained from the solution by crystallization: NaHSO4 + NaCl + 2C → Na2S + 2CO2↑ + HCl↑
Sodium sulfide also is produced from its elements in liquid ammonia: Na + 2S → Na2S.
Definition
ChEBI: A sulfide salt with formula Na2S. The pentahydrate and (particularly) the nonahydrate are also known. In gel form, sodium sulfide is used to soften toenails to assist in trimming (and so relive pain) of ingrowing toenails.
General Description
Sodium sulfide is a yellow to brick red crystalline mass or fused solid with an odor of rotten eggs. If exposed to moist air Sodium sulfide is liable to spontaneous heating and may cause ignition of nearby combustible material. Sodium sulfide absorbs moisture from the air.
Air & Water Reactions
Aqueous solutions of sodium sulfide when exposed to air slowly convert to sodium hydroxide and sodium thiosulfate. The crystalline form upon exposure to air forms hydrogen sulfide and sodium carbonate [Merck 11th ed. 1989].
Reactivity Profile
SODIUM SULFIDE is a white to yellow crystalline material, flammable. Can explode on rapid heating or when shocked. Violent reaction with carbon, charcoal, diazonium salts, N,N-dichloromethylamine, strong oxidizers, water. On contact with acids Sodium sulfide liberates highly toxic and flammable hydrogen sulfide gas. When heated to decomposition Sodium sulfide emits toxic fumes of sodium oxide, and oxides of sulfur [Bretherick, 5th ed., 1995, p. 1729].
Hazard
Flammable, dangerous fire and explosion risk. Strong irritant to skin and tissue, liberates toxic hydrogen sulfide on contact with acids.
Health Hazard
Caustic action on skin and eyes. If ingested may liberate hydrogen sulfide in stomach.
Fire Hazard
Special Hazards of Combustion Products: Irritating sulfur dioxide is produced in fire.
Industrial uses
In non-metallic flotation, sodium sulfide is also used as a depressant and for collector desorption, in particular, fatty acids from monazite, pyrochlore, zircon and microcline. As a depressant for quartz, sodium sulfide is an excellent depressant for iron-activated quartz as well as non-activated quartz.
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, onitroaniline diazonium salt, water. When heated to decomposition it emits toxic fumes of SOx and Na2O. See also SULFIDES
Purification Methods
Some purification of the hydrated salt can be achieved by selecting large crystals and removing the surface layer (contaminated with oxidation products) by washing with distilled water. Other metal ions can be removed from Na2S solutions by passage through a column of Dowex ion-exchange A-1 resin, Na+-form. The hydrated salt can be rendered anhydrous by heating it in a stream of H2 or N2 until water is no longer evolved. (The resulting cake should not be heated to fusion because it is readily oxidised.) Recrystallise it from distilled water [Anderson & Azowlay J Chem Soc, Dalton Trans 469 1986]. Note that sodium sulfide hydrolyses in H2O to form NaHS + H2O, and is therefore alkaline. A 0.1N solution in H2O is 86% hydrolysed at room temperature. Its solubility in H2O is 8% at 0o, 12% at 20o and 30% at 50o. The anhydrous salt is obtained by allowing it to stand in a vacuum over conc H2SO4 or P2O5 at 45o to start with, then at 30-35o when the salt contains 4% of water. The last traces of water are removed by heating to 700o in a glass or porcelain tube in a stream of H2 to give pure H2S. [Fehér in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol I pp 358-360 1963.]
Sodium sulfide Preparation Products And Raw materials
Raw materials
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chevron_right| Supplier | Tel | Country | ProdList | Advantage | Inquiry |
|---|---|---|---|---|---|
| Evans Fine Chem | +91-9821340302 +91-9821340302 | Maharashtra, India | 286 | 58 | Inquiry |
| Kronox Lab Sciences Pvt Ltd | +91-9313231074 +91-9313231074 | Gujarat, India | 240 | 58 | Inquiry |
| Dhara Industries | +91-9322395199 +91-9322395199 | Mumbai, India | 190 | 58 | Inquiry |
| Rikin Industries | +91-7926588543 +91-7926588543 | Gujarat, India | 130 | 58 | Inquiry |
| Krishna Solvechem Ltd. | +91-9223432224 +91-2261230213 | Maharashtra, India | 56 | 58 | Inquiry |
| Eureka Chemicals | +91-2222074176 +91-2222074206 | Maharashtra, India | 11 | 58 | Inquiry |
| Athiappa Chemicals | 91-44-26260119 | Kerela, India | 4 | 58 | Inquiry |
| Vats International | +91-9810131850 +91-9810984000 | New Delhi, India | 19 | 58 | Inquiry |
| United Phosphorus Limited | +91-2271528737 +91-9004390689 | Mumbai, India | 32 | 58 | Inquiry |
| Century Rayon | +91-9819567397 +91-9920995568 | Maharashtra, India | 5 | 58 | Inquiry |
| Supplier | Advantage |
|---|---|
| Evans Fine Chem | 58 |
| Kronox Lab Sciences Pvt Ltd | 58 |
| Dhara Industries | 58 |
| Rikin Industries | 58 |
| Krishna Solvechem Ltd. | 58 |
| Eureka Chemicals | 58 |
| Athiappa Chemicals | 58 |
| Vats International | 58 |
| United Phosphorus Limited | 58 |
| Century Rayon | 58 |
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