Mohr's Salt
| Formula / Notation | FeSO₄·(NH₄)₂SO₄·6H₂O; M = 392.14 g/mol; double salt |
|---|---|
| Also Known As | Ammonium iron(II) sulfate hexahydrate, ferrous ammonium sulfate, Mohr salt |
What is Mohr's Salt?
Ammonium iron(II) sulfate hexahydrate, (NH₄)₂Fe(SO₄)₂·6H₂O. It is a primary standard in volumetric analysis because it is stable in air (iron(II) in this salt is resistant to oxidation). Named after the German chemist Karl Friedrich Mohr.
Formula & Notation
Other Names / Synonyms: Ammonium iron(II) sulfate hexahydrate, ferrous ammonium sulfate, Mohr salt
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
Ammonium iron(II) sulfate hexahydrate, (NH₄)₂Fe(SO₄)₂·6H₂O. It is a primary standard in volumetric analysis because it is stable in air (iron(II) in this salt is resistant to oxidation). Named after the German chemist Karl Friedrich Mohr.
Mohr's salt is used as a primary standard in permanganate and dichromate titrations, as a source of standard Fe²⁺ solutions in analytical chemistry, as a reducing agent, in preparing dilute iron solutions for biological experiments, and as a reference material in colorimetry.
Mohr's salt is of low acute toxicity. Iron(II) compounds are mildly irritating to skin, eyes, and mucous membranes. Ingestion of large amounts can cause iron poisoning. The compound slowly oxidises in air to Fe³⁺ (turns brown/yellow) — use fresh preparations for primary standardisation.
The formula or notation for Mohr's Salt is: FeSO₄·(NH₄)₂SO₄·6H₂O; M = 392.14 g/mol; double salt