Ammonium iron(II) sulfate hexahydrate
Ammonium iron(II) sulfate hexahydrate (CAS 7783-85-9), also known as Mohr's salt, is a blue-green crystalline solid with the linear formula (NH4)2Fe(SO4)2 · 6H2O. With a molecular weight of 392.14 g/mol, it serves as a reliable source of ferrous ions. This compound finds utility in analytical chemistry as a primary standard for redox titrations and in various inorganic synthesis applications.
- IUPAC
- Ammonium ferrous sulfate hexahydrate,Ammonium iron(II) sulfate,Mohr’s salt
- Synonyms
- Mohr's saltAmmonium ferrous sulfate hexahydrateAmmonium iron(II) sulfate

Redox Titrations
Ammonium iron(II) sulfate hexahydrate is frequently employed as a primary standard in analytical chemistry for the quantitative determination of oxidising agents through redox titrations, owing to its stable ferrous ion content.
Inorganic Synthesis
This compound acts as a versatile precursor in the synthesis of various iron-containing compounds and coordination complexes within inorganic chemistry research and development.
Catalysis Research
It can be utilised in the study and development of catalytic processes where ferrous ions play a crucial role in facilitating chemical transformations.
| Molecular weight | 392.14 |
|---|---|
| Linear formula | (NH4)2Fe(SO4)2 · 6H2O |
| Assay | ≥99.0% |
| Grade | ACS reagent |
| Melting point | 100 °C (dec.)(lit.) |

Hazard statements
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Transport (UN / ADR) | UN 3077 9 / PGIII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36/37/38 |
| Safety statements (S) | 26 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Ammonium iron(II) sulfate hexahydrate used for?
+
Ammonium iron(II) sulfate hexahydrate is primarily used as a primary standard in redox titrations for quantitative analysis and as a precursor in inorganic synthesis and catalysis research.
What are the CAS number and formula for Ammonium iron(II) sulfate hexahydrate?
+
The CAS number for Ammonium iron(II) sulfate hexahydrate is 7783-85-9, and its linear formula is (NH4)2Fe(SO4)2 · 6H2O.
What grade and purity does Tech Serve Solutions supply?
+
Tech Serve Solutions supplies Ammonium iron(II) sulfate hexahydrate in ACS reagent grade, with an assay of ≥99.0%. We do not represent this product as USP, BP, or EP grade.
How should Ammonium iron(II) sulfate hexahydrate be handled safely?
+
Handle with appropriate personal protective equipment, including eyeshields, gloves, and a dust mask (type N95 US). Avoid breathing dust and ensure adequate ventilation to prevent respiratory irritation. It is classified as a warning substance causing skin irritation, eye irritation, and respiratory tract irritation.
How is this chemical packed and shipped?
+
This chemical is packed and shipped in compliance with UN 3077, Class 9, Packing Group III regulations, ensuring safe transit for domestic and international export.
How can I request a sample or quote for Ammonium iron(II) sulfate hexahydrate?
+
Please contact our sales team via our website or direct inquiry channels to request a sample or obtain a quotation for Ammonium iron(II) sulfate hexahydrate.
▶ Related products

Benzeneruthenium(II) chloride dimer
Ru2(C6H6)2Cl4
Catalysis & Inorganic
Benzoylferrocene
C17H14FeO
Catalysis & Inorganic
Benzyldiphenylphosphine
C6H5CH2P(C6H5)2
Catalysis & Inorganic
Beryllium
Be
Catalysis & Inorganic
Beryllium oxide
BeO
Catalysis & Inorganic![Bicyclo[2.2.1]hepta-2,5-diene-rhodium(I) chloride dimer — chemical structure, CAS 12257-42-0; Catalysis & Inorganic, fine chemical supplied by Tech Serve Solutions](/_next/image?url=https%3A%2F%2Fpub-f4d920c906024441a773a96f7098e551.r2.dev%2Fimages%2Fproducts%2F12257-42-0.png&w=3840&q=75)
Bicyclo[2.2.1]hepta-2,5-diene-rhodium(I) chloride dimer
Catalysis & Inorganic
![Bis[(10,11-η)-5-[(11bS)-dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-yl- κP4]-5H-dibenz[b,f]azepine]rhodium(I) tetrafluorobo — chemical structure, CAS 1228149-03-8; Catalysis & Inorganic, fine chemical supplied by Tech Serve Solutions](/_next/image?url=https%3A%2F%2Fpub-f4d920c906024441a773a96f7098e551.r2.dev%2Fimages%2Fproducts%2F1228149-03-8.png&w=3840&q=75)
Bis[(10,11-η)-5-[(11bS)-dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepin-4-yl- κP4]-5H-dibenz[b,f]azepine]rhodium(I) tetrafluorobo
1-d:1′
Catalysis & Inorganic![Bis[(2-dimethylamino)phenyl]amine nickel(II) chloride (C16H20ClN3Ni) — chemical structure, CAS 1033772-47-2; Catalysis & Inorganic, fine chemical supplied by Tech Serve Solutions](/_next/image?url=https%3A%2F%2Fpub-f4d920c906024441a773a96f7098e551.r2.dev%2Fimages%2Fproducts%2F1033772-47-2.png&w=3840&q=75)
Bis[(2-dimethylamino)phenyl]amine nickel(II) chloride
C16H20ClN3Ni
Catalysis & Inorganic▶ Explore more

3-Methyl-1,5-di-p-tolyl-1,4-pentazadiene
Chemical Synthesis

3-Methyl-1,5-pentanediol
Chemical Synthesis

3-Methyl-1-(2-methylphenyl)-1H-pyrazol-5-amine
C11H13N3
Chemical Synthesis
3-Methyl-1-(3′-sulfoamidophenyl)-5-pyrazolone
C10H11N3O3S
Chemical Synthesis