Question

what is a alum in chemistry​

Answer 1

An alum (/ˈæləm/) is a type of chemical compound, usually a hydrated double sulfate salt of aluminium with the general formula XAl(SO

4)

2·12H

2O, where X is a monovalent cation such as potassium or ammonium.[1] By itself, "alum" often refers to potassium alum, with the formula KAl(SO

4)

2·12H

2O. Other alums are named after the monovalent ion, such as sodium alum and ammonium alum.

The name "alum" is also used, more generally, for salts with the same formula and structure, except that aluminium is replaced by another trivalent metal ion like chromium(III), and/or sulfur is replaced by other a chalcogen like selenium.[1] The most common of these analogs is chrome alum KCr(SO

4)

2·12H

2O.

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