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[Chemical Knowledge]：Properties and Uses of Ferrous Sulfate

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Ferrous sulfate is an inorganic salt with green crystalline particles or powder form. It has a wide range of uses in the field of chemical production raw materials, mainly because of its unique chemical properties. The following are the main properties and uses of ferrous sulfate.

1. The properties of ferrous sulfate

1. Physical properties: ferrous sulfate is usually green crystalline particles or powder, odorless, relative density 1.898, melting point 64 ℃, soluble in water (1g/1.5ml,25 ℃ or 1g/0.5ml boiling water).
2. chemical properties: ferrous sulfate weathering in the air, the surface becomes yellow, in humid air easily oxidized into insoluble in water brown basic ferric sulfate. Heated to 70~73 ℃ to lose 3 molecules of water, to 80~123 ℃ to lose 6 molecules of water, soluble in glycerol, insoluble in ethanol. Its aqueous solution is slowly oxidized in the air when it is cold, and it is oxidized quickly when it is hot. Adding alkali or dew light can accelerate its oxidation. Relative density (d15)1.897. It's irritating. Anhydrous ferrous sulfate is white powder, containing crystal water is light green crystal, crystal commonly known as "green alum", soluble in water solution is light green.

2. the use of ferrous sulfate

ferrous sulfate in the field of chemical production raw materials has a wide range of uses, mainly in the following aspects:

1. catalyst: ferrous sulfate can be used as a polymerization catalyst, such as in the preparation of high molecular compounds, ferrous sulfate can promote the polymerization of monomer molecules.
2. Reducing agent: ferrous sulfate has strong reducibility and can be used to reduce some metal ions, such as copper ions, silver ions, etc., so as to prepare the corresponding metal elements.
3. preservatives: ferrous sulfate has a certain antibacterial effect, can be used as food, cosmetics and other products of preservatives, to extend the shelf life of the product.
4. Pigments: The green nature of ferrous sulfate allows it to be used as a pigment in areas such as dyeing and coatings.

In general, ferrous sulfate plays an important role in the field of chemical production raw materials, and its unique chemical properties make it widely used in many fields.

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