What Is sodium Sulfide?

Sodium sulfide is a salt i m sorry plays critical role in the organic chemistry industry. The formula for salt sulfide is Na2S, or much more commonly its hydrate Na2S·9H2O. Both the anhydrous and the hydrous salts space colourless solids. Salt sulfide is a water-soluble compound, through a strongly alkaline solution. If the compound is exposed in the moist air, Na2S and its hydrates emit hydrogen sulfide. This emissions smells like a rotten egg. The solid-state of sodium sulfide in solution is a yellow colour, and also it comes together grades, well-known as sodium sulfide flakes. The IUPAC surname of salt sulfide is disodium sulfide. The oxidation variety of sodium sulfide is -2, whereas its pH worth is 10.4.

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Structure Of sodium Sulfide

Na2S by the antifluorite structure. This framework is obtained by trading the location of anions and also cations. This means that the Na+ accounting sites of the fluoride and also S2- host the sites because that Ca2+.

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Sodium Sulfide Properties

Physical nature of salt Sulfide

Chemical Formula of salt sulphide


Physical Appearance

Colourless and hygroscopic solid

The odour of sodium sulfide

Rotten eggs


1.856 g/cm3, for anhydrous

1.58 g/cm3, because that pentahydrate

1.43 g/cm3, because that nonahydrate

Melting suggest of salt sulfide



Slightly soluble in alcohol, Insoluble in ethers

Molar massive of salt sulfide


Bond strength

2/2 = 1

Chemical properties Of salt Sulfide

When salt sulfide is dissolved in water, it creates its matching ions. The reaction the the very same is provided below:

Na2S + H2O → 2Na+ + HS- + OH-

Also, salt sulfide oxidises quickly by heating. The results will be salt carbonate and sulfur dioxide.

2Na2S + 3O2 + 2CO2 → 2Na2CO3 + 2SO2

When sodium sulfide goes under oxidation v hydrogen peroxide, it gives sodium sulfate as a result.

Na2S + 4 H2O2 → 4 H2O + Na2SO4

If sodium sulfide is reacted with sulfur, it creates a polysulfide, provided as below:

2Na2S + S8 → 2Na2S5

How Is salt Sulfide Produced?

In industries, Na2S is developed by a carbothermic reduction reaction. In this palliation reaction, carbon is provided as a reduce agent.

Similarly, for salt sulfide, salt sulfate is reaction by coal.

Na2SO4 + 2 C → Na2S + 2 CO2

In laboratories, the salt sulfide salt is usually prepared by the palliation method. Salt sulphur is reacted by anhydride ammonia, or through sodium in dry THF, v the assist of naphthalene together a catalyst. The an outcome formed will certainly be sodium naphthalenide.

2Na + S → Na2S

Sodium Sulfide Uses

Sodium sulfide is largely used in the pulp and record industry because that the kraft process. As in the kraft process, hardwood is converted right into wood pulp, sodium hydroxide and sodium sulfide help to dissolve the lignin of wood fibre.

This link is offered in water treatment. In this method, sodium sulfide acts together an oxygen scavenger agent

For chemical photography, salt sulfide is supplied as a steel precipitant because that toning black and also white photographs

In the textile industry, salt sulfide is used as a bleaching agent, dechlorinating certified dealer and additionally desulphurising agent.

In the manufacturing of rubber chemicals, sulfur dyes and other chemistry compounds space used.

Used in assorted applications prefer ore flotation, dye-making, oil recovery and also detergent.

Side impacts Of sodium Sulfide

Sodium sulfide is strong alkaline. It have the right to cause significant skin burns. Reacting v acid can type hydrogen sulfide, i m sorry is a highly toxic and flammable gas. In diminished ventilation spaces, hydrogen sulfide accumulation at the bottom. To usage hydrogen sulfide, one need to keep the safety data sheet through them.

Na2S + 2HCl → 2NaCl + H2S(g)

What"s The kind Of Bonding Of salt Sulfide?

Sodium sulfide compound is one ionic compound. There are 2 Na atoms per 1 Sulfide atom. It has actually a central Sulfur atom encircled by 4 Oxygens in covalent bonds. The salt atoms and also Sulfur or Oxygen atoms in the link exchange your electrons. Moreover, Sulfur is in team 6, and also it requires two an ext electrons to acquire a noble gas state that Argon.

Likewise, the remaining 2 salt atoms desire to shed 1 electron each to become the noble gas state the Neon. Thus, the 2 sodium atoms each carry out one electron to the Sulfur atom, helping it to be stable in its outer shell.

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Since the salt atoms offer away every its extra electrons to its outermost shell, the two atoms achieve the noble gas construction of Neon and hence become stable.