ammonium alum
Definition
Noun: 1. A white crystalline double sulfate of aluminum: Specifically, it is the ammonium double sulfate of aluminum, a chemical compound with the formula NH₄Al(SO₄)₂·12H₂O. It is a type of alum.
Usage
- Ammonium alum is primarily used in water purification, leather tanning, dyeing textiles, and as an astringent in cosmetics and medicine.
- It is often discussed in chemistry contexts concerning its crystalline structure, solubility, or chemical properties.
Examples
- The laboratory used ammonium alum to clarify the water sample.
- Ammonium alum is a common ingredient in some natural deodorant crystals.
- The chemical formula for ammonium alum is NH₄Al(SO₄)₂·12H₂O.
Advanced Usage
- In crystal growth: Ammonium alum is sometimes used in educational demonstrations to grow large, clear crystals due to its solubility properties.
- As a mordant: In traditional dyeing processes, ammonium alum helps fix dyes to fabric fibers.
Variants and Related Words
- Alum: A more general term for a class of double sulfate salts of which ammonium alum is one type. Other common alums include potassium alum.
- Ammonium aluminum sulfate: A systematic chemical name for ammonium alum.
Synonyms
- Ammonium aluminum sulfate
- Aluminum ammonium sulfate
Related Phrases/Compounds
- Burnt ammonium alum: Refers to ammonium alum that has been heated to remove its water of crystallization, resulting in a powdered form used as a drying agent or in some industrial processes.
Noun
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a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum
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