Sodium Sulfide, Formula, Chemical Properties, Preparation, Uses

Sodium Sulfide

Sodium sulfide is a chemical compound which has a strong alkaline solution. It is exposed in the moisture air that means it emits the strong rotten eggs smell. By the carthothermic reaction the coal is used to produce the sodium sulfide. They are colourless in the both forms such as anhydrous and hydrated salts. Due to the presence of the polysulfides it have a yellow appearance. The systematic IUPAC name is known as sodium sulfide . The chemical or molecular formula of sodium sulfide is Na2S. It is also known as disodium sulfide.

Structural Formula

This is the structural formula of the sodium sulfide:

Sodium Sulfide

Chemical Formula

The chemical formula of the sodium sulfide is Na2S.

Preparation Method

There are two methods for preparing the sodium sulfide. They are in the carbothermic reactions the sodium sulfate is reacted with the coal at the moderate temperature and it gives the result of sodium sulfide. Carbon dioxide is emitted as the byproduct.  In the another method the sulfur can be reduced to the sodium with the anhydrous ammonia it could be the formed the sodium sulfide. The naphthalene is used as the catalyst substances.

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Na2SO4 + 2C → Na2S + 2CO2

2Na + S → Na2S

Physical Properties

Melting point 1176C
Boiling point decomposes
Molecular weight 78.0452g/mol
Density 1.86g/cm3
Solubility in water Soluble
Crystal structure Antifluorite (cubic)
Magnetic susceptibility -39.0×10-6cm3/mol
Appearance Colourless hydroscopic solid
Solubility Insoluble in ether

Slightly soluble in alcohol

Chemical Properties

Sodium sulfide has a highly harmful substances that contains the autoignition temperature over 480C.  it is more hazardous to the environment. The melting point is very high and decomposed at the boiling point. It is insoluble in ether and slightly soluble in alcohol. It is antifluorite in structure. It has low density and moderate molar mass. It looks like a colourless hydroscopic in the appearance.


Sodium sulfide is mainly used for photography and bleaching powder for textile industry. In paper industry they manufacturing a pulp in craft process. It is widely used for water treatment as an oxygen scavenger agent. In leather processing it is used an unhairing agent.


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