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Ferric rubidium alum, Rb2SO4.Fe2(SO4)3

Ferric rubidium alum, Rb2SO4.Fe2(SO4)3.24H2O, and ferric caesium alum, Cs2SO4.Fe2(SO4)3.24H2O, have been obtained by electrolysis in an analogous manner to the iron ammonium alum. They are of a delicate violet colour, turning slightly greenish upon exposure to air. Their solubilities in water with rise of temperature are as follow-:

Temperature, °C25303540
Grams Rb2SO4.Fe2(SO4)3 per litre of water97.4202.4(5)(5)
Grams Cs2SO4.Fe2(SO4)3 per litre of water17.125.237.560.4

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