Posted by kelly on Sunday, October 10, 2010 at 1:05pm.
There are several alums; the one most people mean when they speak of "alum" is potassium aluminum sulfate with the formula of KAl(SO4)2.12H2O
%sulfate = (molar mass SO4/molar mass KAl(SO4)2.12H2O)*100 = ??
That sounds about right...
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