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What is pseudo alum?

Updated: 4/28/2022
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10y ago

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A pseudo alum is a double sulfate of the typical formula ASO4·B2(SO4)3·22H2O, where A is a divalent metal ion, such as cobalt (wupatkiite), manganese (apjohnite), magnesium (pickingerite) or iron (halotrichite or feather alum), and B is a trivalent metal ion. i.e. class of alums in which the usual monovalent metal of a true alum is replaced by a bivalent metal

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10y ago
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Q: What is pseudo alum?
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