Substance profile
Iron (II) sulfate
Iron (II) sulfate is white orthorhombic crystals, hygroscopic.
01 · Identification
What Iron (II) sulfate is
Iron (II) sulfate is white orthorhombic crystals, hygroscopic. Its molecular formula is FeO4S and its molecular weight is 151.91 g/mol. It boils at 300 °C, melts at 64 °C, is soluble in water.
Under the GHS it carries the signal word Warning.
02 · GHS classification
Hazards and label elements
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
| Code | Hazard statement |
|---|---|
| H302 | Harmful if swallowed. |
| H315 | Causes skin irritation. |
| H319 | Causes serious eye irritation. |
Precautionary statements: P264, P270, P280, P301, P302, P305, P312, P313, P330, P332, P337, P338, P352
03 · Physical and chemical properties
Iron (II) sulfate properties
Every value is shown with the conditions it was measured under and the source it came from. Where sources disagree, all values are listed rather than one being picked — the difference is usually a different form of the substance, not an error.
| Property | Value | Conditions | Source |
|---|---|---|---|
| Boiling point | 300 °C (572 °F) | above this value | DrugBank |
| Melting point | 64 °C (147.2 °F) | DrugBank | |
| Density | 3.56 g/cm³ | HSDB | |
| 2.97 g/cm³ | at 25 °C | HSDB | |
| 3.65 g/cm³ | at 25 °C | DOE PAC | |
| Solubility | White to yellow crystalline powder. Sol in water. Loses water @ about 300 °C; decomp @ higher temp. | Ferrous sulfate monohydrate | HSDB |
| Soluble in water. | HSDB | ||
| 25.6 g/100 mL | DrugBank | ||
| Autoignition temperature | Not flammable (USCG, 1999) | CAMEO |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
04 · Handling and storage
Storing and handling Iron (II) sulfate
Storage conditions
Store in tight containers.
Source: Hazardous Substances Data Bank (HSDB)
Incompatible materials
May ignite on contact with arsenic trioxide and sodium nitrate.
Source: Hazardous Substances Data Bank (HSDB)
Reactivity
Weak inorganic reducing agents, such as FERROUS SULFATE, react with oxidizing agents to generate heat and products that may be flammable, combustible, or otherwise reactive.
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check Iron (II) sulfate in the storage compatibility matrix →