Iron(2+) sulfate heptahydrate
A hydrate that is the heptahydrate form of iron(2+) sulfate. It is used as a source of iron in the treatment of iron-deficiency anaemia (generally in liquid-dosage treatments; for solid-dosage treatments, the monohydrate is normally used). — ChEBI
Safety documents & references
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Identity & molecular properties
Source-linked values| CAS number | 7782-63-0 | ChEBI ↗ |
| Molecular formula | Fe.7H2O.O4S | ChEBI ↗ |
| Molar mass | 278.013 g/mol | ChEBI ↗ |
| Monoisotopic mass | 277.96062 Da | ChEBI ↗ |
| Formal charge | 0 | ChEBI ↗ |
| ChEBI identifier | CHEBI:75836 | ChEBI ↗ |
Cross-source molecular data
PubChem| Molar mass | 278.02 g/mol | PubChem ↗ |
| Exact mass | 277.960618 Da | PubChem ↗ |
PubChem computed values are shown separately from the ChEBI record. An exact InChIKey match was used to connect the records. Molecular descriptors do not describe a supplied product’s purity, particle size or performance.
Names & structural identifiers
Copy any identifieriron(2+) sulfate heptahydrateiron(2+) sulfate--water (1/7)SURQXAFEQWPFPV-UHFFFAOYSA-LO.O.O.O.O.O.O.O=S(=O)([O-])[O-].[Fe+2]InChI=1S/Fe.H2O4S.7H2O/c;1-5(2,3)4;;;;;;;/h;(H2,1,2,3,4);7*1H2/q+2;;;;;;;;/p-2Names & synonyms
Names are supplied by ChEBI. Trade names and related synonyms may describe a broader product context.
Classification & relationships
ChEBI ontologyRoles recorded in ChEBI
Database role annotations describe reported biological or chemical roles; they are not product approvals or recommendations for use.
Safety classification · Japan
NITE / Japanese governmentIron(II) sulfate heptahydrate · 25A0075
| Endpoint | Reported classification |
|---|---|
| Acute toxicity （Oral） | Category 4 |
| Hazardous to the aquatic environment （Acute） | Category 3 |
Selected source-reported endpoints. Other endpoints, rationales and conditions remain in the original classification. Missing or unlisted information does not mean non-hazardous. This is not a global classification or transport decision.
Read the original NITE classificationMass ↔ amount of substance
Calculated from sourced massUses 278.013 g/mol from ChEBI. Assumes the substance described by this record; no purity or concentration correction is applied.
Elemental composition
Theoretical mass fractionsFeOSHCalculated theoretical mass fractions from the reported formula and PubChem periodic-table atomic masses. These are not assay or purity results.
Research & patent references
Selected source associationsSources & record history
Checked 27 Sep 2026Release 255, 9 September 2026. ChEBI three-star (manually annotated) source entry. View original record ↗ · CC BY 4.0
PubCAS formats source data, connects references and computes explicitly labelled conversions. CAS cross-references are supplied by ChEBI; they do not constitute CAS verification or endorsement.