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Ferric rubidium selenium alum, Rb2SeO4.Fe2(SeO4)3

Ferric rubidium selenium alum, Rb2SeO4.Fe2(SeO4)3.24H2O, is obtained when the requisite amount of rubidium carbonate is added to a solution of freshly precipitated ferric hydroxide in excess of aqueous selenic acid.

The alum crystallises out in pale violet crystals, belonging to the cubic system. Its density at 15° C. is 2.1308. At 40° to 45° C. the crystals melt in their combined water, yielding a red liquid.

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