Item	Parameter
Molecular weight	78.04
Melting point	950°C
Density	1.86 g/mL (25°C)
Water solubility	186 g/L (20°C)
Appearance	Pure anhydrous product: white crystals; industrial-grade product is usually pale yellow, light pink, or brownish yellow due to impurities
Form	Lumps, flakes, granules

Physical and Chemical Properties:

Hygroscopic; absorbs moisture from humid air and releases hydrogen sulfide gas (with a rotten egg odor)

Readily soluble in water; its aqueous solution is strongly alkaline and corrosive

Decomposes in contact with acids, producing toxic hydrogen sulfide gas

Readily oxidized in air

II. Main Uses

Sodium sulfide is an important inorganic chemical raw material, widely used in the following fields:

Applications	Specific Uses
Leather Tanning Industry	Hair-removal agent for raw hides
Pulp and Paper Industry	Pulp cooking agent used in the kraft pulping process
Dye Industry	Raw material for sulfur dyes; reducing agent for dye intermediates; mordant for textile dyeing
Mineral Processing Industry	Ore flotation agent
Man-Made Fiber Industry	Desulfurizing agent for viscose fibers
Chemical Raw Materials	Used to produce products such as sodium hydrosulfide, sodium polysulfide, and sodium thiosulfate
Water Treatment	Assists in removing metal impurities from mine wastewater
Textile Dyeing and Printing	Bleaching agent used as an alternative to sodium chlorite and hydrogen peroxide for removing yellow stains

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