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alum
Sign in to savethumb|upright=1.5|Crystal of potassium alum,
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Wikidata facts
- Has part
- water of crystallization
- Image
- Chromium Alum - top view.jpg
Show 5 more facts
- described by source
- Encyclopædia Britannica 11th edition
- different from
- alunite
- Commons category
- Alum
- on focus list of Wikimedia project
- Wikipedia:Vital articles/Level/4
- crystal habit
- octahedron
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Encyclopedic overview
26 sectionsContents
- History
- Alum found at archaeological sites
- Alumen in Pliny and Dioscorides
- Alum described in medieval texts
- Modern understanding of the alums
- Production
- Types
- Chemical properties
- Crystal structure
- Solubility
- Uses
- Industrial processes
- Topical antihemorrhagic
- Deodorant
- Bread
- Textiles and paper
- Jewellery
- Other
- Related compounds
- Selenate-containing alums
- Mixed alums
- Other hydrates
- Other double sulfates
- See also
- References
- External links
thumb|upright=1.5|Crystal of potassium alum,
An alum () is a type of chemical compound, usually a hydrated double sulfate salt of aluminium with the general formula , such that is a monovalent cation such as potassium or ammonium. By itself, alum often refers to potassium alum, with the formula . Other alums are named after the monovalent ion, such as sodium alum and ammonium alum.
Excerpted from Wikipedia’s “alum” article, available under the CC BY-SA 4.0 licence.
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