potassium alum
Definition
- Noun:
- A white crystalline double sulfate of aluminum: Specifically, it is the potassium double sulfate of aluminum, a chemical compound with the formula KAl(SO₄)₂·12H₂O. It is a type of alum.
Usage Examples
- Noun:
- Potassium alum is commonly used as an astringent in aftershave products.
- The crystal structure of potassium alum is often studied in chemistry classes.
- This deodorant contains potassium alum to help reduce perspiration.
Advanced Usage
- "Alum" as a general term: In common parlance, "alum" often refers to potassium alum, though it can technically refer to a class of double sulfate salts.
- For this experiment, we will use alum, specifically potassium alum.
Variants and Related Words
- Alum (noun): A general term for a class of double sulfate salts of aluminum. Potassium alum is the most common type.
- Alum is used in water purification and leather tanning.
- Ammonium alum (noun): A related compound where ammonium replaces potassium as the cation.
- Potash alum (noun): Another name for potassium alum.
Synonyms
- Alum: (when used to specifically mean potassium alum)
- Potash alum:
- KAl(SO₄)₂·12H₂O: The chemical formula.
Related Phrases
- Alum block: A solid block of potassium alum used for skincare.
- He uses an alum block to soothe his skin after shaving.
- Alum crystal: A crystal formed from potassium alum.
- We grew large alum crystals for the science fair.
Noun
-
a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum
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