Aluminium Sulfate - Al2(SO4)3

What is Aluminium Sulfate (Al2(SO4)3)?

Al2(SO4)3 is a chemical compound with chemical name Aluminium sulfate.

Aluminium sulfate is also called Filter Alum or Dialuminum trisulfate. It is a white crystalline solid in its anhydrous form and in its solution form it appears as a colourless liquid. Both the forms are non-toxic and non-combustible.

Aluminium sulfate is soluble in water but insoluble in ethanol. It is odourless and has a mildly astringent taste, sweet taste. On decomposing, it emits toxic fumes of sulphur oxides. The solution of aluminium sulfate is corrosive to aluminium. This compound is produced in the laboratory by adding aluminium hydroxide, to sulphuric acid.

Properties of Aluminium Sulfate – Al2(SO4)3

Al2(SO4)3 Aluminium sulfate
Molecular Weight/ Molar Mass 342.15 g/mol
Density 2.672 g/cm3
Boiling Point 214° F
Melting Point 770 °C

Aluminium Sulfate Structure (Al2(SO4)3 Structure)

Aluminium Sulfate Structure

Aluminium Sulfate (Al2(SO4)3 ) Uses

  • It is used in baking soda.
  • It is used for gardening to balance the soil PH.
  • Used in the purification of water.
  • It is used in the dyeing of cloth.
  • It is used in making paper.
  • Used for the printing on cloth.
  • It is used in concrete as an accelerator and waterproofing agent.
  • It is used in firefighting foam.
  • It is used in sewage treatment.
  • It is used as the fireproofing agent.

Frequently Asked Questions

How is aluminium sulfate made?

Aluminium sulfate is formed by reacting with the correct amount of sulphuric acid to freshly precipitated aluminium hydroxide. The solution that results is then evaporated and allowed to crystallize. Accessible as pure, lustrous crystals, granules, or powder.

What type of compound is aluminium sulfate?

Aluminium sulfate is an ionic compound, a combination of both positive and negative ions. Ions are charged atoms, which may either be monatomic ions (single atoms) or polyatomic (multiple atoms combined to form a charged part). Aluminium forms a + 3 ion, Al+3, and sulphate is the -2 polyatomic ion, (SO4)-2.

How dangerous is aluminium sulfate?

Aluminium sulfate is an irritant to the skin and eyes, so you should wear gloves and eye protection while dealing with it. It is mildly dangerous if aluminium sulfate is swallowed in any way because when the salt is swallowed it can form extremely corrosive sulphuric acid.

Why is aluminium sulfate soluble in water?

Aluminium sulfate is a chemical compound produced with Al2(SO4)3. It is soluble in water and is primarily used in purification of drinking water and wastewater treatment plants as a coagulating agent (promoting particle collision by neutralizing charge) as well as in paper processing.

What is the smell of Aluminium sulphate?

Aluminium sulfate is an odourless, white crystalline hygroscopic compound, moderately water-soluble and insoluble in organic solvents. This has an acidic flavour.

Learn more about the Structure, physical and chemical properties of Aluminium sulfate (Al2(SO4)3) from the experts at BYJU’S.

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