Alum
family of double sulfate salts of monovalent and trivalent cations From Wikipedia, the free encyclopedia
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Alum is both a specific chemical compound and a class of chemical compounds.
- It means potassium aluminium sulfate, a chemical compound.
- It also means a double sulfate salt.
 | It has been suggested that this article be split into multiple articles accessible from a disambiguation page. (Discuss) Proposed since January 2015. |
Examples:
- Potash alum is potassium aluminum sulfate
- Sodia alum is sodium aluminum sulfate
- Ammonium alum is ammonium aluminum sulfate
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History
Words like "alum" and "potash" were used before modern chemistry developed. The word 'alumen' occurs in Pliny's Natural History (23–79 AD). In the 52nd chapter of his 35th book, he gives a detailed description. Different substances were distinguished by the name of 'alumen', but they were all astringents,[1] and were all used in dyeing and medicine.
Notes
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