Iron (ii) sulfate
| Formula | FeO4S*7H2O |
| Chemical formula | FeSO4*7H2O |
| Density | 1.89 g/cm3 (20°c) |
| Molar mass | 278.02 g/mol |
| Bulk density | 600 kg/m3 |
| CAS number | 7782-63-0 |
| HS Code | 28332950 |
| EC number | 231-753-5 |
| Storage | Store at 15 to 25 °C |
| SDS | available |
| R Phrase | R 22 |
| S Phrase | S 24/25 |
| RTECS | NO8510000 |
| Odour | oderless |
| Form | solid |
| Color | bluish -green |
| p H | 3.0 – 4.0(50g/l 20 °C ) |
| Solubility in water | 400g/l (20°C) |
| Solubility in ethanol | insoluble |
| Melting point | >60 °C |
| Thermal decomposition | >300 °C |
| Assay | 99.0 – 104.5 | % | |
| Description | Conforms | ||
| Identification | Conforms | ||
| Apperance of solution | Conforms | ||
| Heavy metals | ≤ | 0/005 | % |
| pH | 3.0 to 4.0 |
Iron (II) sulfate (chemical formula: FeSO₄), also known as ferrous sulfate, is an inorganic salt composed of iron and sulfate ions. It most commonly appears as blue-green crystals in its heptahydrate form and has been historically referred to as green vitriol.
🏭⚗️ Production
Iron (II) sulfate is typically produced as a byproduct of steel manufacturing when iron is treated with sulfuric acid. It can also be obtained from the oxidation of pyrite or as a secondary product in the pickling of iron or steel.
🔬 Properties
Iron (II) sulfate usually appears as pale green or blue-green crystalline solid in its heptahydrate form. It has a melting point around 64 °C (heptahydrate) and decomposes upon further heating. It is soluble in water, forming pale green solutions of the hexaaqua complex [Fe(H₂O)₆]²⁺. It is paramagnetic and slowly oxidizes in moist air to form iron (III) compounds, resulting in a yellowish or brown surface. The anhydrous form is a white powder.
🧪 Applications
• Medical: Used in iron supplements to treat iron-deficiency anemia.
• Agriculture: Applied to correct iron chlorosis in plants and as a soil amendment to reduce alkalinity.
• Water treatment: Used to remove phosphates and as a flocculant.
• Pigments and dyes: Historically used in ink production (iron gall ink) and as a mordant in dyeing.
• Industrial: Employed in the production of other iron compounds and as a reducing agent in chemical processes.
