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Iron - LoveToKnow 1911 |
 | | Ferrous fluoride, FeF 21 is obtained as colourless prisms (with 8H 2 O) by dissolving iron in hydrofluoric acid, or as anhydrous colourless rhombic prisms by heating iron or ferric chloride in dry hydrofluoric acid gas. |
 | | Ferrous bromide, FeBr 2, is obtained as yellowish crystals by the union of bromine and iron at a dull red-heat, or as bluish-green rhombic tables of the composition FeBr 2.6H 2 O by crystallizing a solution of iron in hydrobromic acid. |
 | | Ferrous sulphate, green vitriol or copperas, FeSO 4.7H 2 O, was known to, and used by, the alchemists; it is mentioned in the writings of Agricola, and its preparation from iron and sulphuric acid occurs in the Tractatus chymico-philosophicus ascribed to Basil Valentine. |
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