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Sodium Sulfide
Sodium Sulfide

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Sodium Sulfide
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Product: Sodium Sulfide

High Quality

Earliest Shipment

Competitive price

Professional Service

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.



Sodium sulfideIdentifiersPropertiesStructureHazardsRelated compounds
Other names[hide]Disodium sulfide
CAS number1313-82-2 Y,
1313-84-4 (pentahydrate)
1313-84-4 (nonahydrate)
EC number215-211-5
UN number1385 (anhydrous)
1849 (hydrate)
RTECS numberWE1905000
Molecular formulaNa2S
Molar mass78.0452 g/mol (anhydrous)
240.18 g/mol (nonahydrate)
Appearancecolorless, hygroscopic solid
Density1.856 g/cm3 (anhydrous)
1.58 g/cm3 (pentahydrate)
1.43 g/cm3 (nonohydrate)
Melting point

1176 °C (anhydrous)
100 °C (pentahydrate)
50 °C (nonhydrate)

Solubility in water186 g/L (20 °C)
390 g/L (50 °C)
Solubilityinsoluble in ether
slightly soluble in alcohol
Crystal structureAntifluorite (cubic), cF12
Space groupFm3m, No. 225
Tetrahedral (Na+); cubic (S2–)
EU Index016-009-00-8
EU classificationCorrosive (C)
Dangerous for the environment (N)
R-phrasesR31, R34, R50
S-phrases(S1/2), S26, S45, S61
NFPA 704131
>480 ºC
Other anionsSodium oxide
Sodium selenide
Sodium telluride
Other cationsLithium sulfide
Potassium sulfide
Related compoundsSodium hydrosulfide

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