ferrous sulfate
The Columbia Encyclopedia, Sixth Edition | Date: 2008
ferrous sulfate or iron (II) sulfate, chemical compound, FeSO 4 . It is known as the monohydrate, FeSO 4 ·H 2 O; the tetrahydrate, FeSO 4 ·4H 2 O; the pentahydrate, FeSO 4 ·5H 2 O; and the heptahydrate, FeSO 4 ·7H 2 O. The heptahydrate is also called green vitriol, copperas, or melanterite (a mineral that commonly occurs with pyrite). It is a blue-green monoclinic crystalline water-soluble salt. It is prepared commercially by oxidation of pyrite (iron sulfide) or by treating iron with sulfuric acid. It is used in the manufacture of inks, in wool dyeing as a mordant, and in water purification as a substitute for aluminum sulfate. It melts at 64°C, and at 90°C it loses water of hydration to form the monohydrate, a white, monoclinic, crystalline powder that occurs naturally as the mineral szomolnokite. The mineral siderotil is iron sulfate pentahydrate.
Author not available, FERROUS SULFATE.,
The Columbia Encyclopedia, Sixth Edition 2008
The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press
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Related entries from encyclopedias, dictionaries, and thesauruses
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sulfate
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... solution; the white barium sulfate precipitate that forms is insoluble in hydrochloric acid. Sulfates are widely distributed in nature. Barium sulfate occurs as barite ; calcium sulfate is found as gypsum , alabaster , and selenite; Epsom salts is magnesium sulfate; sodium sulfate ...
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siderotil
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see ferrous sulfate .
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melanterite
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: see ferrous sulfate .
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szonolmokite
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see ferrous sulfate .
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hydrate
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... compound that contains water. A common hydrate is the familiar blue vitriol, a crystalline form of cupric sulfate . Chemically, it is cupric sulfate pentahydrate, CuSO 4 ·5H 2 O. When a crystal of the substance is formed, five molecules of water (H 2 O) are combined in the crystal with each molecule of cupric ...
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