Sodium Sulfide
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Product: Sodium Sulfide
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Competitive price
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Sodium sulfide is the name used to refer to the chemical compound Na2S, but more commonly it refers to the hydrate Na2S·9H2O. Both are colorless water-soluble salts that give strongly alkaline solutions. When exposed to moist air, Na2S and its hydrates emit hydrogen sulfide, which smells much like rotten eggs or flatus. Generally, commercially available sodium sulfide is not a unique chemical entity, but it is 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. Such technical grades of sodium sulfide have a yellow appearance. These grades of sodium sulfide are marketed as 'sodium sulfide flakes'. Although the solid is yellow, solutions of it are colorless.
| Other names[hide]Disodium sulfide | |
| CAS number | 1313-82-2 Y, 1313-84-4 (pentahydrate) 1313-84-4 (nonahydrate) |
| PubChem | 237873 |
| EC number | 215-211-5 |
| UN number | 1385 (anhydrous) 1849 (hydrate) |
| RTECS number | WE1905000 |
| Molecular formula | Na2S |
| Molar mass | 78.0452 g/mol (anhydrous) 240.18 g/mol (nonahydrate) |
| Appearance | colorless, hygroscopic solid |
| Density | 1.856 g/cm3 (anhydrous) 1.58 g/cm3 (pentahydrate) 1.43 g/cm3 (nonohydrate) |
| Melting point | 1176 °C (anhydrous) |
| Solubility in water | 186 g/L (20 °C) 390 g/L (50 °C) |
| Solubility | insoluble in ether slightly soluble in alcohol |
| Crystal structure | Antifluorite (cubic), cF12 |
| Space group | Fm3m, No. 225 |
| Coordination geometry | Tetrahedral (Na+); cubic (S2–) |
| MSDS | ICSC 1047 |
| EU Index | 016-009-00-8 |
| EU classification | Corrosive (C) Dangerous for the environment (N) |
| R-phrases | R31, R34, R50 |
| S-phrases | (S1/2), S26, S45, S61 |
| NFPA 704 | 131 |
| Autoignition temperature | >480 ºC |
| Other anions | Sodium oxide Sodium selenide Sodium telluride |
| Other cations | Lithium sulfide Potassium sulfide |
| Related compounds | Sodium hydrosulfide |
