Aluminum sulfide, additionally called dialuminium trisulfide, is one ionic compound of aluminum and sulfur stood for by the chemical formula Al2S3 <1, 2>. It exist in different crystalline forms and hydrolyzes to aluminum hydroxide/oxide <3, 4>.

Aluminum Sulfide Identification

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

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Aluminum Sulfide Formula

How is Aluminum Sulfide Prepared

Its synthesis through straight heating that aluminum and also sulfur deserve to be stood for by the complying with equation <7>:

2Al + 3S → Al2S3

However, the reaction is very exothermic, and also it is not preferable to warm the whole mixture <7>. Also, sulfur is a volatile reactant the melts away before the reaction takes ar <7>. Therefore, lead sulfide is regularly used because that the ready of Al2S3 <7>:

2Al + 3PbS → Al2S3 + 3Pb


Aluminum Sulfide

Reactions with other Compounds

Aluminum Sulfide and Water

When aluminum sulfide is exposed to moisture in the atmosphere, it experience hydrolysis reaction to form aluminum hydroxide and also hydrogen sulfide <5>.

Al2S3 + 6H2O → 2Al(OH)3 + 3H2S

Aluminum Sulfide and also Hydrochloric Acid

Aluminum sulfide top top reacting through hydrochloric acid develops hydrogen sulfide and also aluminum chloride, as shown listed below <8>:

Al2S3 + 6HCl → 2AlCl3 + 3H2S


Aluminum Sulfide Lewis Structure

Properties and Characteristics of 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 volume (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 decision Structure

What is It provided for

Producing organic compounds choose ethanethiol and also chemicals forced for tanning and making document <10>Preparing hydrogen sulfide that has actually several commercial uses <11>

Is Aluminum Sulfide Toxic

Exposure come aluminum sulfide can cause skin and severe eye wake up <12>. Inhalation of dust, vapor, or fumes have the right to cause challenge in breathing <12>.


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