Back كبريتيد الصوديوم Arabic Natrium sulfid Azerbaijani سودیوم سولفید AZB সোডিয়াম সালফাইড Bengali/Bangla Sulfur de sodi Catalan Sulfid sodný Czech Natriumsulfid German Θειούχο νάτριο Greek Natria sulfido Esperanto سدیم سولفید Persian
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| Names | |
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| Other names
Disodium sulfide
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| Identifiers | |
3D model (JSmol)
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| ChEBI | |
| ChemSpider | |
| ECHA InfoCard | 100.013.829 |
| EC Number |
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PubChem CID
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| RTECS number |
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| UNII |
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| UN number | 1385 (anhydrous) 1849 (hydrate) |
CompTox Dashboard (EPA)
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| Properties | |
| Na2S | |
| Molar mass | 78.0452 g/mol (anhydrous) 240.18 g/mol (nonahydrate) |
| Appearance | colorless, hygroscopic solid |
| Odor | none |
| Density | 1.856 g/cm3 (anhydrous) 1.58 g/cm3 (pentahydrate) 1.43 g/cm3 (nonohydrate) |
| Melting point | 1,176 °C (2,149 °F; 1,449 K) (anhydrous) 100 °C (pentahydrate) 50 °C (nonahydrate) |
| 12.4 g/100 mL (0 °C) 18.6 g/100 mL (20 °C) 39 g/100 mL (50 °C) (hydrolyses) | |
| Solubility | insoluble in ether slightly soluble in alcohol[1] |
| −39.0·10−6 cm3/mol | |
| Structure | |
| Antifluorite (cubic), cF12 | |
| Fm3m, No. 225 | |
| Tetrahedral (Na+); cubic (S2−) | |
| Hazards | |
| GHS labelling: | |
   
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| Danger | |
| H302, H311, H314, H400 | |
| P260, P264, P270, P273, P280, P301+P312, P301+P330+P331, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P310, P312, P321, P322, P330, P361, P363, P391, P405, P501 | |
| NFPA 704 (fire diamond) | |
| > 480 °C (896 °F; 753 K) | |
| Safety data sheet (SDS) | ICSC 1047 |
| Related compounds | |
Other anions
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Sodium oxide Sodium selenide Sodium telluride Sodium polonide |
Other cations
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Lithium sulfide Potassium sulfide Rubidium sulfide Caesium sulfide |
Related compounds
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Sodium hydrosulfide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Sodium sulfide is a chemical compound with the formula Na2S, or more commonly its hydrate Na2S·9H2O. Both the anhydrous and the hydrated salts in pure crystalline form are colorless solids, although technical grades of sodium sulfide are generally yellow to brick red owing to the presence of polysulfides and commonly supplied as a crystalline mass, in flake form, or as a fused solid. They are water-soluble, giving strongly alkaline solutions. When exposed to moist air, Na2S and its hydrates emit hydrogen sulfide, an extremely toxic, flammable and corrosive gas which smells like rotten eggs.
Some commercial samples are specified as Na2S·xH2O, where a weight percentage of Na2S is specified. Commonly available grades have around 60% Na2S by weight, which means that x is around 3. These grades of sodium sulfide are often marketed as 'sodium sulfide flakes'.
- ^ Kurzin, Alexander V.; Evdokimov, Andrey N.; Golikova, Valerija S.; Pavlova, Olesja S. (June 9, 2010). "Solubility of Sodium Sulfide in Alcohols". J. Chem. Eng. Data. 55 (9): 4080–4081. doi:10.1021/je100276c.