Ferrous sulfate CAS#7720-78-7
Historically Proven Iron Compound
Green vitriol (iron(II) sulfate, FeSO₄·7H₂O) has been known since the 13th century and is traditionally obtained by crystallization from iron or iron-based materials reacted with dilute sulfuric acid.High Solubility & Multiple Hydration Forms
The heptahydrate forms green monoclinic crystals with high water solubility (296 g/L at 25 °C) and can be converted into mono-, tetra-, or anhydrous forms through controlled dehydration processes.Thermal Transformation Capability
Upon heating, iron(II) sulfate undergoes systematic dehydration and eventually decomposes at high temperatures to form iron(III) oxide (Fe₂O₃), releasing sulfur dioxide and sulfur trioxide.Industrial Relevance of Iron(III) Oxide
The resulting iron(III) oxide, also known as hematite, is a stable, high-temperature-resistant material widely used in industry. It dissolves in dilute acids to form iron(III) salts and can be reduced to metallic iron under controlled conditions.
Ferrous Sulfate (CAS No. 7720-78-7)
Ferrous sulfate, also known as green vitriol (FeSO₄·7H₂O), is a well-known iron compound produced by crystallizing iron in dilute sulfuric acid. The heptahydrate form appears as green crystals with high water solubility (296 g/L at 25 °C).
Ferrous sulfate exists in several hydration states, including heptahydrate, tetrahydrate, and monohydrate, which can be obtained through controlled heating or crystallization. When heated strongly, it decomposes to form iron(III) oxide and sulfur oxides. The resulting iron(III) oxide (hematite) is a stable, reddish-brown material widely used in industrial applications.
Ferrous sulfate Chemical Properties
| Melting point | decomposes at 671℃ [JAN85] |
| density | 3.65 |
| vapor pressure | 0Pa at 20℃ |
| storage temp. | Store at +15°C to +25°C. |
| solubility | Water (Slightly) |
| form | white orthorhombic crystals |
| color | white orthorhombic crystals, crystalline; hygroscopic |
| Odor | at 100.00?%. odorless |
| PH | 2.5 (20°C, 50g/L in H2O) |
| Water Solubility | g/100g solution H2O: 13.6 (0°C), 22.8 (25°C), 24.0 (100°C); solid phase, FeSO4 · 7H2O (0°C, 25°C), FeSO4 ·H2O (100°C) [KRU93] |
| Dielectric constant | 14.2（14℃） |
| Cosmetics Ingredients Functions | ASTRINGENT |
| InChI | InChI=1S/Fe.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/p-2 |
| InChIKey | BAUYGSIQEAFULO-UHFFFAOYSA-L |
| SMILES | [Fe+2].S([O-])([O-])(=O)=O |
| CAS DataBase Reference | 7720-78-7(CAS DataBase Reference) |
| NIST Chemistry Reference | Ferrous sulfate(7720-78-7) |
| EPA Substance Registry System | Ferrous sulfate (7720-78-7) |
Safety Information
| Risk Statements | 25 |
| Safety Statements | 45 |
| HS Code | 28332910 |
| Hazardous Substances Data | 7720-78-7(Hazardous Substances Data) |
| Toxicity | LD50 oral in rat: 319mg/kg |
Product Applications of Ferrous Sulfate (CAS No. 7720-78-7)
Ferrous sulfate is widely used as a nutritional supplement and dietary ingredient as an effective source of iron. It appears as a white to grayish, odorless powder with high bioavailability. The heptahydrate form contains approximately 20% elemental iron, while the dried form provides about 32% iron. It dissolves slowly in water and is commonly applied in the fortification of baking mixes, infant foods, cereals, and pasta products. In encapsulated form, ferrous sulfate shows improved stability and reduced interaction with lipids in cereal flours.
In addition to food and nutritional uses, ferrous sulfate is an important raw material in the chemical industry and is utilized in the manufacture of sulfur dioxide, sulfuric acid, and other iron-based compounds.
Factory & Equipment Overview
Modern production facilities and advanced equipment ensure stable quality, consistent purity, and reliable supply.
