TITLE

Alum

PUB. DATE
January 2009
SOURCE
World Book Science Dataset;1/1/2009, p1
SOURCE TYPE
Encyclopedia
DOC. TYPE
Reference Entry
ABSTRACT
Alum, a chemical compound of two sulfates and water. (A sulfate is a compound of sulfur, oxygen, and one or more other elements.) One of the two sulfates usually contains aluminum, but it can be any other metal with a valence of 3, such as chromium or iron. The other sulfate usually contains an alkali metal, such as potassium, but can instead contain either another metal with a valence of 1 or ammonium (a group of atoms formed by combining ammonia and hydrogen). At ordinary temperatures, all alums are solids.
ACCESSION #
37309786

 

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