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Alum, 500 g

Ages 12+
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Aluminum potassium sulfate is commonly called alum. Use this metal sulfate to learn how to grow large gem-like crystals using a seed crystal! (Dodecahydrate form) Read More

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This is the Dodecahydrate form of aluminum potassium sulfate, commonly called alum. Learn how to grow large gem-like crystals with alum using a seed crystal! You can conduct this experiment at home or in the classroom. You can also use this bottle of alum to make your own crystal-filled geode and to build a water treatment system!

Formula  AlK(SO4)2•12H2O 
Formula Weight 474.377
Density 1.76 g/cm³
Grade Reagent
Form Crystalline
CAS # 7784-24-9
DOT Classification Non-Regulated
Storage Code Green 
Shelf Life 36 Months
Alternate Name Potassium aluminum sulfate dodecahydrate
Common Uses Water purification, leather dyeing, etc.


Note: If you're looking for a smaller quantity of alum for a science experiment, check out Alum, 100 g.


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