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Atomistry » Aluminium » Chemical properties » Ammonium alum | ||
Atomistry » Aluminium » Chemical properties » Ammonium alum » |
Ammonium alum, (NH4)2SO4.Al2(SO4)3
Ammonium alum, (NH4)2SO4.Al2(SO4)3.24H2O, was formerly manufactured in England to a very large extent, but at the present time it is mainly the potassium salt that is prepared. Commercial alum is often a mixture of potassium and ammonium alums.
Ammonium aluminium sulphate octahydrate, (NH4)2SO4.Al2(SO4)3.8H2O, may be prepared like the corresponding potassium salt (Marino), or by seeding a supersaturated solution of ammonium alum with a crystal of the corresponding thallic salt, (NH4)2SO4.Tl2(SO4)3.8H2O. |
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