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Potassium ferri-tetrasulphite, K4Fe2(SO3)4SO4

Potassium ferri-tetrasulphite, K2Fe2(SO3)4.K2SO4 or K4Fe2(SO3)4SO4, is obtained by adding sodium hydrogen sulphite solution to one of potassium ferro-heptanitroso sulphide, KFe4(NO)7S3, in alcohol and allowing to stand at the ordinary temperature for a couple of weeks. The salt separates as yellow, microscopic needles, insoluble in cold water. Acids dissolve the salt readily, and boiling with water effects the precipitation of ferric hydroxide.

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