rautaIIsulfaatti

Iron(II) sulfate, commonly known as ferrous sulfate, is an inorganic salt with the formula FeSO4. In Finnish it is called rauta(II) sulfaatti. The most widely used form is the heptahydrate, FeSO4·7H2O, which forms blue‑green crystals that dissolve readily in water. In air, ferrous salts are oxidized to ferric species, so the anhydrous form and some solutions can gradually convert to iron(III) compounds such as Fe2O3 or Fe(OH)3.

Ferrous sulfate is typically prepared by reacting iron with sulfuric acid: Fe + H2SO4 → FeSO4 + H2. The heptahydrate crystallizes from aqueous solution and can be dried to give the anhydrous salt, which is less stable in air. In solution, Fe2+ ions can act as reducing agents and are susceptible to oxidation to Fe3+.

Applications include medical use as an iron supplement for treating iron-deficiency anemia, where it helps restore iron levels in the body. It is also employed in textile dyeing as a mordant and in various chemical analyses as a reducing agent. In agriculture, ferrous sulfate serves as a source of iron for plants, helping to correct chlorosis in certain crops.

Safety and handling: ferrous sulfate is toxic in large quantities and can cause gastrointestinal irritation and other symptoms if ingested. It should be stored in a dry, tightly closed container away from oxidizers. Prolonged exposure or improper use can lead to staining of skin or clothing and should be avoided.