出典:Wikipedia
出典:『Wikipedia』 (2011/06/09 20:46 UTC 版)
Alum ( /ˈæləm/) is both a specific chemical compound and a class of chemical compounds. The specific compound is the hydrated potassium aluminium sulfate (Potassium alum) with the formula KAl(SO4)2.12H2O. The wider class of compounds known as alums have the related empirical formula, AB(SO4)2.12H2O.