what is alum?give two common uses of alum?how do you prepare a true solution of alum?
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An alum (/ˈæləm/) is a type of chemical compound, usually a hydrated double sulfatesalt of aluminium with the general formulaXAl(SO
4)
2·12H
2O, where X is a monovalentcation 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 chalcogen like selenium.[1] The most common of these analogs is chrome alum KCr(SO
4)
2·12H
2O.
Aluminium-based alums have been used since antiquity, and are still important in many industrial processes.
The most widely used alum is potassium alum. It was used since antiquity as a flocculant to clarify turbid liquids, as a mordant in dying, and in tanning. It is still widely used in the treatment of water, in medicine, for cosmetics (in deodorant), in food preparation (in baking powder and pickling), and to fire-proof paper and cloth.
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An alum (/ˈæləm/) is a type of chemical compound, usually a hydrated double sulfatesalt of aluminium with the general formulaXAl(SO
4)
2·12H
2O, where X is a monovalentcation 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 chalcogen like selenium.[1] The most common of these analogs is chrome alum KCr(SO
4)
2·12H
2O.
Aluminium-based alums have been used since antiquity, and are still important in many industrial processes.
The most widely used alum is potassium alum. It was used since antiquity as a flocculant to clarify turbid liquids, as a mordant in dying, and in tanning. It is still widely used in the treatment of water, in medicine, for cosmetics (in deodorant), in food preparation (in baking powder and pickling), and to fire-proof paper and cloth.
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ndnishok:
you just copied and pasted it from wikipedia
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