Aluminum sulfide, also called dialuminium trisulfide, is an ionic compound of aluminum and also sulfur stood for by the chemistry formula Al2S3 <1, 2>. It exists in various crystalline forms and hydrolyzes to aluminum hydroxide/oxide <3, 4>.

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Aluminum Sulfide Identification

CAS Number1302-81-4 <1, 2>
PubChem CID16684788 <6>
ChemSpider ID140154 <1>
EC Number215-109-0 <1, 2>


Aluminum Sulfide Formula

How is Aluminum Sulfide Prepared

Its synthetic through straight heating the aluminum and sulfur can be stood for by the complying with equation <7>:

2Al + 3S → Al2S3

However, the reaction is very exothermic, and it is not desirable to warm the entire mixture <7>. Also, sulfur is a volatile reactant that melts away prior to the reaction takes place <7>. Therefore, lead sulfide is often used for the preparation of Al2S3 <7>:

2Al + 3PbS → Al2S3 + 3Pb


Aluminum Sulfide

Reactions with other Compounds

Aluminum Sulfide and Water

When aluminum sulfide is exposed to humidity in the atmosphere, it undergoes hydrolysis reaction to type aluminum hydroxide and hydrogen sulfide <5>.

Al2S3 + 6H2O → 2Al(OH)3 + 3H2S

Aluminum Sulfide and Hydrochloric Acid

Aluminum sulfide top top reacting with hydrochloric acid forms hydrogen sulfide and also aluminum chloride, as shown below <8>:

Al2S3 + 6HCl → 2AlCl3 + 3H2S


Aluminum Sulfide Lewis Structure

Properties and Characteristics the Aluminum Sulfide

General Properties

Molar Mass/Molecular Weight150.158 g/mol <1>

Physical Properties

Color and AppearanceGray flour or granules <2>
Melting Point1,100 °C, 2,012 °F <2>
Boiling Point1,500 °C, 2,732 °F <2>
Density2.32 g cm-3 <2>
State of issue at room temperature (solid/liquid/gas)Solid <2>
SolubilityInsoluble in (CH3)2CO (acetone) <9>
Solubility in WaterReacts and also decomposes in H2O <9>
Heat capacity (C) 105.1 J/mol K
Standard Molar Enthalpy-724 kJ/mol <9>
Standard Molar Entropy116.9 J/mol K

Atomic Properties

Crystal StructureTrigonal, tetragonal, hexagonal <3, 4>


Aluminum Sulfide crystal Structure

What is It used for

Producing organic compounds prefer ethanethiol and chemicals required for tanning and also making paper <10>Preparing hydrogen sulfide that has actually several industrial uses <11>

Is Aluminum Sulfide Toxic

Exposure to aluminum sulfide can cause skin and also severe eye wake up <12>. Inhalation that dust, vapor, or fumes deserve to cause difficulty in breathing <12>.



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