alumˈæl əm
alum (n)
English Definitions:
alum, ammonia alum, ammonium alum (noun)
a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum
alum, potassium alum, potash alum (noun)
a white crystalline double sulfate of aluminum: the potassium double sulfate of aluminum
alumnus, alumna, alum, graduate, grad (noun)
a person who has received a degree from a school (high school or college or university)
alum (noun)
a double sulphate of aluminum and potassium that is used as an astringent (among other things)
Alum
Alum is both a specific chemical compound and a class of chemical compounds. The specific compound is the hydrated potassium aluminium sulfate with the formula KAl(SO4)2·12H2O. More widely, alums are double sulphate salts, with the formula AM(SO4)2·12H2O, where A is a monovalent cation such as potassium or ammonium and M is a trivalent metal ion such as aluminium or chromium.
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