The anhydrous substance is white crystal and easy to deliquescence.Industrial products because of impurities often pink, brown, yellow block.Melting_point 1180 ºC;Relative Density 1.856 (14ºC);Solubility soluble in water (solubility 15.4g/100ml water at 10ºC and 57.2g/100ml water at 90ºC).Slightly soluble in alcohol, insoluble in ether.The aqueous solution is strongly alkaline.Dissolve in sulfur to form sodium polysulfide.Melting point: 50 ºC;Relative density :-;Solubility :180 g/L (25ºC). 

Sodium sulfide is the chemical compound with the formula Na2S, or more commonly its 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 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'. Although the solid is yellow, solutions of it are colorless.

Application

1. Dyestuff industry, printing and dyeing industry for the production of sulfide  dye or  help dye.

2. Hydrolysis make rawhide hair removal used in leather industry , Papermaking industry is used as paper cooking agent.

3. Textile industry is used to  a rtificial fiber denitration  and  The reduction of nitrate content.

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