Ammonium alumAmmonium aluminium sulfate, also known as ammonium alum or just alum (though there are many different substances also called "alum"), is a white crystalline double sulfate usually encountered as the dodecahydrate, formula (NH4)Al(SO4)2·12H2O. Read from the Chembox of the Wikipedia article Ammonium alum, revision 1380125125.

Property

Value

Formula

H4AlNO8S2, 237.14 g/mol

Melting point

93.5 °C

Boiling point

120 °C

Density

2.45 g/cm³

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