Alums
| Formula / Notation | MAl(SO₄)₂·12H₂O |
|---|---|
| Also Known As | Double sulfate salts, potassium alum (KAl(SO₄)₂·12H₂O), chrome alum, ferric alum |
What is Alums?
Alums are a class of double sulfate salts with the general formula XM(SO₄)₂·12H₂O, where X is a monovalent cation and M is a trivalent metal ion. The most common is potassium alum KAl(SO₄)₂·12H₂O, widely used in water purification, food processing, and as an astringent.
Formula & Notation
Other Names / Synonyms: Double sulfate salts, potassium alum (KAl(SO₄)₂·12H₂O), chrome alum, ferric alum
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
Alums are a class of double sulfate salts with the general formula XM(SO₄)₂·12H₂O, where X is a monovalent cation and M is a trivalent metal ion. The most common is potassium alum KAl(SO₄)₂·12H₂O, widely used in water purification, food processing, and as an astringent.
Potassium alum is used as a mordant in textile dyeing, as a coagulant in water purification, in food preservation, and in cosmetic astringents. Chrome alum is used in leather tanning. Alums serve as leavening agents in baking powder.
Alums are generally of low toxicity. Large ingested quantities can cause gastrointestinal irritation. Aluminium-containing alums should be used with care in individuals with renal impairment. Avoid inhalation of fine alum dust.
The formula or notation for Alums is: MAl(SO₄)₂·12H₂O