Aluminum sulfide, also referred to as dialuminium trisulfide, is an ionic compound of aluminum and sulhair stood for by the chemical formula Al2S3 <1, 2>. It exists in different crystalline creates and also 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 synthesis via straight heating of aluminum and sulhair have the right to be stood for by the complying with equation <7>:

2Al + 3S → Al2S3

However before, the reactivity is extremely exothermic, and also it is not preferable to warmth the whole mixture <7>. Also, sulhair is a volatile reactant that melts ameans before the reactivity takes location <7>. Thus, lead sulfide is often supplied for the preparation of Al2S3 <7>:

2Al + 3PbS → Al2S3 + 3Pb


Aluminum Sulfide

Reactions via Other Compounds

Aluminum Sulfide and Water

When aluminum sulfide is exposed to moisture in the environment, it undergoes hydrolysis reactivity to create aluminum hydroxide and also hydrogen sulfide <5>.

Al2S3 + 6H2O → 2Al(OH)3 + 3H2S

Aluminum Sulfide and Hydrochloric Acid

Aluminum sulfide upon reacting via hydrochloric acid forms hydrogen sulfide and aluminum chloride, as presented below <8>:

Al2S3 + 6HCl → 2AlCl3 + 3H2S


Aluminum Sulfide Lewis Structure

Properties and also Characteristics of Aluminum Sulfide

General Properties

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

Physical Properties

Color and also AppearanceGray powder 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 like ethanethiol and chemicals forced for tanning and also making paper <10>Preparing hydrogen sulfide that has actually a number of industrial supplies <11>

Is Aluminum Sulfide Toxic

Exposure to aluminum sulfide deserve to cause skin and also significant eye irritation <12>. Inhalation of dust, vapor, or fumes have the right to cause obstacle in breapoint <12>.


Potassium Sulfide

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