Molekula
Iron(II) sulfate heptahydrate
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Iron(II) sulfate heptahydrate is a hydrated inorganic salt used in laboratory research, water treatment, and as a precursor in the synthesis of other iron compounds. It appears as pale green crystals and is soluble in water. CAS: 7782-63-0, Molecular formula: FeSO₄·7H₂O, Molecular weight: 278.02 g/mol, Storage: Ambient, Signal word: Warning. Molekula supplies Iron(II) sulfate heptahydrate from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Often bought together
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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250 g — £23.00 per pack ex VAT · £27.60 inc. VAT
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1 kg — £46.70 per pack ex VAT · £56.04 inc. VAT
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Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Solid |
| Identification | Complies with tests for iron and sulphate |
| pH | 2.5 - 3.8 (50g/l aq. @ 20°C) |
| Solubility | 1g in 1.5ml of water |
| Assay | 99.5 - 104.5% |
| Lead (Pb) | ≤ 2ppm |
| Mercury (Hg) | ≤ 1ppm |
| Arsenic (As) | ≤ 3ppm |
| Description | Ferrous sulphate occurs as pale, blue-green crystals or granules that are efflorescent in dry air. In moist air, it oxidizes readily to form a brown-yellow, basic ferric sulphate |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Acid |
Identification
| Property | Value |
|---|---|
| SKU | 70696439 |
| CAS Number | 7782-63-0 |
| IUPAC Name | iron(2+);sulfate;heptahydrate |
| Molecular Formula | FeSO4·7H2O |
| Molecular Weight | 278.02 |
| Exact Mass | 277.9606 |
| SMILES | O.O.O.O.O.O.O.[O-]S(=O)(=O)[O-].[Fe+2] |
| InChIKey | SURQXAFEQWPFPV-UHFFFAOYSA-L |
| InChI | InChI=1S/Fe.H2O4S.7H2O/c;1-5(2,3)4;;;;;;;/h;(H2,1,2,3,4);7*1H2/q+2;;;;;;;;/p-2 |
| PubChem CID | 62662 |
| REACH Code | Y110 |
| Tariff Code | 28332980 |
Safety & GHS
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Health Hazard
GHS07
Hazard statements
- H302 Harmful if swallowed
- H315 Causes skin irritation
- H319 Causes serious eye irritation
- H412 Harmful to aquatic life with long lasting effects
Precautionary statements
- P273 Avoid release to the environment
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P301+312 IF SWALLOWED: Call a POISON CENTER or doctor/physician if you feel unwell
- P302+352 IF ON SKIN: Wash with soap and water
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
- P337+313 If eye irritation persists get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- FERROUS SULFATE HEPTAHYDRATE
- Fesotyme
- Iron sulfate heptahydrate
- Iron(2+) sulfate heptahydrate
- Iron(II) sulfate (1:1), heptahydrate
- Irosul
- Melanterite mineral
- Siderotil mineral
- Szomolnikite mineral
- Tauriscite mineral
Frequently asked questions
What is Iron(II) sulfate heptahydrate used for?
It is commonly used as a precursor in the synthesis of other iron compounds, in water treatment for phosphate removal, and as a nutrient in agricultural fertilizers.
What is the chemical formula and molecular weight?
The formula is FeSO4·7H2O with a molecular weight of 278.02 g/mol.
How should it be stored?
Store at ambient temperature in a dry, well-ventilated area away from oxidizing agents.
What grade is available?
Available in laboratory grade; custom grades may be available upon request.
Can Molekula supply it in bulk?
Yes, bulk quantities are available—please contact our sales team for pricing and availability.
What documentation comes with the order?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS); additional documentation can be provided upon request.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.