Functional Roles
Industries Served
Physical Properties
physical_description
Ferrous sulfate appears as a greenish or yellow-brown crystalline solid. Density 15.0 lb /gal. Melts at 64 u00b0C and loses the seven waters of hydration at 90 u00b0C. The primary hazard is the threat to the environment. Immediate steps should be taken to limit its spread to the environment. Used for water or sewage treatment, as a fertilizer ingredient.
color/form
White orthorhombic crystals, hygroscopic
boiling_point
> 300 u00b0C
melting_point
64
solubility
White to yellow crystalline powder. Sol in water. Loses water @ about 300 u00b0C; decomp @ higher temp. /Ferrous sulfate monohydrate/
density
Density 2.970 at 25 u00b0C; off-white, monoclinic crystals. /Ferrous sulfate monohydrate/
logp
-0.84
stability/shelf_life
In moist air, ferrous sulfate rapidly oxidizes and becomes coated with brownish-yellow ferric sulfate... . The rate of oxidation is increased by the addition of alkali or by exposure to light.
autoignition_temperature
Not flammable (USCG, 1999)
decomposition
When heated to decomposition it emit toxic fumes of /sulfur oxide/.
refractive_index
INDEX OF REFRACTION: 1.471, 1.478, 1.486; MP 64 u00b0C LOSING 6H2O; BP 300 u00b0C LOSING 7H2O. /FERROUS SULFATE HEPTAHYDRATE/
dissociation_constants
-3
other_experimental_properties
Standard molar enthalpy (heat) of formation at 298.15 deg K is -928.4 kJ/mol (crystal); Standard molar Gibbs energy of formation at 298.15 deg K is -820.8 kJ/mol (crystal); Standard molar entropy at 298.15 deg K is 107.5 J/mol K (crystal); Molar heat capacity at constant pressure at 298.15 deg K is 100.6 J/mol K (crystal)
GHS / SDS Safety
Warning
Irritant
- H315: Causes skin irritation [Warning Skin corrosion/irritation]
- Not Classified
- Reported as not meeting GHS hazard criteria by 3 of 3 companies. For more detailed information, please visit ECHA C&L website.
- H302: Harmful if swallowed [Warning Acute toxicity, oral]
- H302 (99.8%): Harmful if swallowed [Warning Acute toxicity, oral]
- H319 (99.8%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]
- H319: Causes serious eye irritation [Warning Serious eye damage/eye irritation]
- H315 (99.8%): Causes skin irritation [Warning Skin corrosion/irritation]
Chemical Identity
| CAS Number | 7720-78-7 |
| IUPAC Name | iron(2+) sulfate |
| InChI Key | BAUYGSIQEAFULO-UHFFFAOYSA-L |
| PubChem CID | 24393 |
| INCI Name | FERROUS SULFATE |
Synonyms & Trade Names
Full Description
Ferrous Sulfate (FeSO4) is an iron(II) salt supplied as a white to yellow crystalline powder that functions as a pH adjustment agent in industrial applications. This water-soluble inorganic compound serves critical roles in agriculture and household, industrial & institutional (HI&I) cleaning formulations where precise pH control is required.