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Alum zhelezoammoniyny

Alum zhelezoammoniyny

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Ukraine, Nikolaev
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Description
Alum [1] — binary salts, crystalline hydrates of sulfates of three - and monovalent metals of the general formula M+2SO4·M3+2(SO4)3·24H2O (other record M+M3+(SO4)2·12H2O), where M + — one of alkaline metals (lities, sodium, potassium, rubidium or caesium), and M3+ — one of trivalent metals (usually aluminum, chrome or iron (III)). Ions of ammonium (NH4+) can also act as M+, the replaced ammonium ions (for example, CH3NH3+) can also be part of alum.

Also selenatny alum of similar structure of M+M3+ (SeO4) 2·12H2O in which sulfate ion is replaced with selenate ion are known.

Alum can be received by mixing of hot equimolar water solutions of sulfates of the corresponding metals, when cooling such solutions from them alum crystallizes.
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