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Properties
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Molecular formula
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FeSO4
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Molar mass
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151.908 g/mol (anhydrous)
169.92 g/mol (monohydrate) 278.05 g/mol (heptahydrate) |
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Appearance
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blue/green or white crystals
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Density
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2.84 g/cm3 (anhydrous)
1.898 g/cm3 (heptahydrate) |
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Melting point
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70 °C (dehydration of heptahydrate)
400 °C (decomp) |
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Solubility in water
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25.6 g/100mL (anhydrous)
48.6 g/100 mL (heptahydrate) (50°C) |
Usage
Industrially, ferrous sulfate is mainly used as a precursor to other iron compounds. It is a reducing agent, mostly for the reduction of chromate in cement.
In horticulture it is used for treating iron chlorosis.[3] Although not as rapid-acting as iron chelate, its effects are longer-lasting. It can be mixed with compost and dug into to the soil to create a store which can last for years.[4] It is also used as a lawn conditioner,[4] and moss killer.