Sodium sulfide (CAS 1313-84-4)

Sodium sulfide (CAS 1313-84-4)

Sodium sulfide is the chemical compound with the formula Na2S, or more commonly its hydrate Na2S·9H2O. Both the anhydrous and the hydrated salts are colorless solids. They are water-soluble, giving strongly alkaline solutions. When exposed to moist air, Na2S and its hydrates emit hydrogen sulfide, 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. Such technical grades of sodium sulfide have a yellow appearance owing to the presence of polysulfides. These grades of sodium sulfide are marketed as ‘sodium sulfide flakes’.

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Product Description


Industries: Paints and varnishes
CAS number: 1313-84-4
WE number: 215-211-5
Index number: 016-009-00-8
Chemical formula: Na2S·9H2O
Molar mass: 240,18 g/mol
Customs tariff code: 28301000
ADR: UN1849

Other physical properties

pH: 12,4 (100g/l H2O w 20°C)
Melting / freezing point: 1180°C
Relative density: 1,86 g/cm3 (14°C)

Dimensions N/A
Pieejamais apjoms

25 kg bag