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Ferrous sulfate is an inorganic substance with the chemical formula FeSO4 and its appearance is a white powder with no odor. Its crystalline hydrate is a heptahydrate at normal temperature, commonly known as "green vitriol". It is a light green crystal that weathers in dry air and is oxidized to brown basic iron sulfate on its surface in humid air. It becomes a tetrahydrate at 56.6°C. , becomes monohydrate at 65°C. Ferrous sulfate is soluble in water and almost insoluble in ethanol. Its aqueous solution oxidizes slowly in the air when it is cold and oxidizes quickly when it is hot. Adding alkali or exposure to light can accelerate its oxidation. Relative density (d15)1.897. Irritating. Ferrous sulfate can be used as chromatographic analysis reagent and droplet analysis to determine platinum, selenium, nitrite and nitrate. Ferrous sulfate can also be used as a reducing agent, ferrite production, water purification, polymerization catalyst, photographic plate making, etc.
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