| Identification | More | [Name]
Sodium hydrosulfide | [CAS]
16721-80-5 | [Synonyms]
SODIUM BISULFIDE
SODIUM HYDROGEN SULFIDE
SODIUM HYDROGEN SULPHIDE
SODIUM HYDROSULFIDE
SODIUM SULFHYDRATE
hidrosulfurosodics
hydrogenosulfuredesodium(french)
hydrogenosulfuredesodium,anhydre
hydrogenosulfuredesodium,dihydrate
hydrogensodiumsulfide
sodiumhydrogensulfide(nahs)
sodiumhydrosulfide(na(hs))
sodiumhydrosulfide,anhydrous
sodiumhydrosulfide,dihydrate
sodiumhydrosulfide,solid
sodiumhydrosulfide,solid,withlessthan25%waterofcrystallization
sodiumhydrosulfide,solution
sodiumhydrosulfide,withnotlessthan25%waterofcrystallization
sodiumhydrosulphide
sodiummercaptan | [EINECS(EC#)]
240-778-0 | [Molecular Formula]
HNaS | [MDL Number]
MFCD00011124 | [Molecular Weight]
56.06 | [MOL File]
16721-80-5.mol |
| Chemical Properties | Back Directory | [Appearance]
white crystals or powder with a very unpleasant smell | [Melting point ]
55°C | [density ]
1,79 g/cm3 | [RTECS ]
WE1900000 | [Fp ]
90°C | [solubility ]
soluble in H2O, EtOh, ethyl ether | [form ]
Solid | [color ]
Off-white | [Stability:]
Stable, but hygroscopic. Flammable solid. May ignite in air. | [Water Solubility ]
620 g/L (20 ºC) | [Sensitive ]
Moisture Sensitive & Hygroscopic | [CAS DataBase Reference]
16721-80-5(CAS DataBase Reference) | [EPA Substance Registry System]
16721-80-5(EPA Substance) |
| Safety Data | Back Directory | [Hazard Codes ]
C,F | [Risk Statements ]
R31:Contact with acids liberates toxic gas.
R34:Causes burns. | [Safety Statements ]
S25:Avoid contact with eyes .
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection .
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) . | [RIDADR ]
2318 | [TSCA ]
Yes | [HazardClass ]
4.2 | [PackingGroup ]
II | [Safety Profile]
Poison by intraperitoneal and subcutaneous routes. Mutation data reported. A corrosive irritant to skin, eyes, and mucous membranes. Flammable when exposed to heat or flame. Spontaneous combustion. Reacts violently with Qazonium salts. Readily yields HS. When heated to decomposition it emits toxic fumes of SO, and NazO. See also SULFIDES and MERCAPTANS. | [Hazardous Substances Data]
16721-80-5(Hazardous Substances Data) |
| Hazard Information | Back Directory | [General Description]
Sodium hydrosulfide is a colorless to light yellow crystalline solid or fused mass. SODIUM HYDROSULFIDE, SOLID, WITH LESS THAN 25% WATER OF CRYSTALLIZATION(16721-80-5) is corrosive to skin and metal. Used in paper pulping, manufacturing dyes, and dehairing hides. | [Reactivity Profile]
A chemical base. Reacts with acids to release flammable and toxic gaseous hydrogen sulfide. As long as the solution is kept strongly alkaline, pH > 10, there is very little release of H2S. At pH = 7, the percent concentration of H2S released is close to 80%. | [Air & Water Reactions]
Soluble in water. The solution slowly evolves hydrogen sulfide gas. Crystals hydrolyze in moist air to sodium hydroxide and sodium sulfide. Liable to spontaneous heating in moist air. | [Hazard]
Contact with acids causes evolution of toxic
gases.
| [Health Hazard]
Fire will produce irritating, corrosive and/or toxic gases. Inhalation of decomposition products may cause severe injury or death. Contact with substance may cause severe burns to skin and eyes. Runoff from fire control may cause pollution. | [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. | [Chemical Properties]
white crystals or powder with a very unpleasant smell | [Uses]
In paper pulping, in dyestuffs processing, in rayon and cellophane desulfurizing, in unhairing hides and as a bleaching reagent Sodium hydrogen sulfide is used in cloth, paper, pulp and dyestuff industries. It acts as a floating agent in copper mining as well as to remove hairs from hides in leather industries. It is also used as an intermediate in synthetic chemistry. It is utilized as a raw material in the production of ammonium sulphate and ethanethiol. | [Uses]
the copper ore beneficiation,the sulfurous acid dyeing of manmade fibre,the synthesis of organic intermediates,the preparation of auxiliary agent of sulfur dyes,and waste water treatment; raw material to produce ammonium sulphate and ethanethiol | [Flammability and Explosibility]
Nonflammable | [Industrial uses]
Sodium hydrosulfide (NaHS) is stable only in solution. When in contact with oxygen
(air), it slowly oxidizes. If a solution of NaHS is heated, it is converted into Na2S and H2S.
Sodium hydrosulfide can be used as a replacement for Na2S·9H2O during sulfidization
of oxide minerals. Sodium hydrosulfide in solution has a much lower alkalinity than
Na2S.
Although the performance of NaHS is not the same as for Na2S, it is used because of its
cost-effectiveness. |
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