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Send EmailAmmonium Ferrous Sulfate, Ammonium Ferrous Sulphate Hegzahydrate, Ferroammonium Sulfate, Iron Ammonium Sulfphate, 7783-85-9
AMMONIUM FERROUS SULFATE HEXAHYDRATE – AMONYUM DEMİR (II) SÜLFAT HEKZAHİDRAT
CAS Number: 7783-85-9
EC Number (EINECS): 233-151-8
Molecular Formula: (NH₄)₂Fe(SO₄)₂·6H₂O
Molecular Weight: 392.14 g/mol
Chemical Class: Inorganic iron salt (double salt)
SECTION 1: CHEMICAL IDENTITY AND DEFINITION
| Parameter | Information |
|---|---|
| Chemical Name (IUPAC) | Ammonium iron(II) sulfate hexahydrate |
| Other Names | Mohr's Salt, Ammonium Ferrous Sulfate, Ferroammonium Sulfate, Iron Ammonium Sulfate |
| Chemical Formula | (NH₄)₂Fe(SO₄)₂·6H₂O |
| Molecular Weight | 392.14 g/mol |
| CAS Number | 7783-85-9 |
| EC Number (EINECS) | 233-151-8 |
| Chemical Class | Inorganic iron salt (double salt) |
| Appearance | Blue-green to light green crystalline solid |
| Odor | Odorless |
| Physical State (20°C) | Solid (crystalline) |
| Iron Valence | Fe²⁺ (iron(II)) |
SECTION 2: PHYSICAL PROPERTIES
| Property | Value |
|---|---|
| Appearance | Blue-green to light green crystalline solid |
| Odor | Odorless |
| Molecular Weight | 392.14 g/mol |
| Density (20°C) | 1.86 g/cm³ |
| Melting Point | 100 – 110 °C (loses water) |
| Boiling Point | Decomposes |
| Solubility in Water (20°C) | Highly soluble |
| Solubility in Water (100°C) | Very highly soluble |
| Solubility in Ethanol | Insoluble |
| pH (5% solution) | 3.0 – 4.0 (acidic) |
| Crystal Water Content | 27.6% (6 H₂O) |
| Iron Content | ~14.2% (Fe²⁺) |
| Stability in Air | Relatively stable; oxidizes slowly |
| Hygroscopicity | Low |
SECTION 3: CHEMICAL PROPERTIES
| Property | Information |
|---|---|
| Chemical Formula | (NH₄)₂Fe(SO₄)₂·6H₂O |
| Molecular Weight | 392.14 g/mol |
| Chemical Class | Inorganic iron salt (double salt) |
| Structure | Double salt of (NH₄)₂SO₄ and FeSO₄·6H₂O |
| Iron Valence | Fe²⁺ (+2) |
| Oxidation | Slowly oxidizes to Fe³⁺ in air |
| Stability | More stable than other Fe²⁺ salts (stabilized by ammonium sulfate) |
| Thermal Decomposition | Loses water at 100-110°C; decomposes above 250°C |
| Incompatible Materials | Strong oxidizing agents, strong bases, alkalies |
Chemical Structure:
(NH₄)₂Fe(SO₄)₂·6H₂O
Ammonium Ferrous Sulfate Hexahydrate
(Mohr's Salt)
SECTION 4: MOHR'S SALT – A STANDARD REAGENT
| Property | Description |
|---|---|
| Unique Property | High stability; does not oxidize easily |
| Use as Standard | Used as a primary standard in redox titrations |
| Iron Content | Fe²⁺ content is precisely known and stable |
| Air Oxidation | Oxidizes much slower than ferrous sulfate |
| Pure Solutions | Stable solutions can be prepared in acidic media |
| Advantage | Easy to weigh, stable, available in high purity |
SECTION 5: APPLICATION AREAS
5.1. Analytical Chemistry (Most Important Use)
| Application | Function |
|---|---|
| Redox Titrations | Used as primary standard (permanganate, dichromate titrations) |
| Standard Iron Solution | Preparation of Fe²⁺ standard solutions |
| Calibration | Standard for spectrophotometric calibration |
| Gravimetric Analysis | Precipitation reactions |
5.2. Laboratory Reagent
| Application | Function |
|---|---|
| Chemical Synthesis | As reagent |
| Biochemistry | Enzyme studies |
| Photochemistry | Fricke dosimetry (high-dose gamma ray measurement) |
5.3. Industrial Applications
| Application | Function |
|---|---|
| Water Treatment | As coagulant |
| Textile | As dye fixative |
| Leather Processing | Tanning aid |
| Photography | As developer component |
5.4. Medical Applications
| Application | Function |
|---|---|
| Antianemic Agent | Used in treatment of iron deficiency anemia |
SECTION 6: COMPARISON WITH FERROUS SULFATE
| Property | Mohr's Salt | Ferrous Sulfate (FeSO₄·7H₂O) |
|---|---|---|
| Chemical Formula | (NH₄)₂Fe(SO₄)₂·6H₂O | FeSO₄·7H₂O |
| Molecular Weight | 392.14 g/mol | 278.01 g/mol |
| Iron Content | ~14.2% | ~20.1% |
| Stability | More stable | Less stable |
| Oxidation | Slow | Fast |
| Shelf Life | Long | Short |
| Weighing | Easy (stable) | Difficult (oxidizes) |
| Use as Standard | Primary standard | Generally not used |
| Color | Light green | Blue-green |
SECTION 7: QUALITY SPECIFICATIONS (ANALYTICAL GRADE)
| Parameter | Specification (ACS / USP / Ph. Eur.) |
|---|---|
| Appearance | Blue-green to light green crystals |
| Identification | Positive (Iron, Ammonium and Sulfate tests) |
| Assay (Fe) | 13.8 – 14.6% |
| Loss on Drying | 26.0 – 28.0% |
| pH (5% solution) | 3.0 – 4.0 |
| Chlorides (Cl) | ≤ 0.001% |
| Sulfates (SO₄) | ≤ 0.01% |
| Heavy Metals (as Pb) | ≤ 10 ppm |
| Lead (Pb) | ≤ 2 ppm |
| Arsenic (As) | ≤ 3 ppm |
| Mercury (Hg) | ≤ 1 ppm |
| Ferric Iron (Fe³⁺) | ≤ 0.02% |
| Manganese (Mn) | ≤ 0.005% |
| Zinc (Zn) | ≤ 0.005% |
| Copper (Cu) | ≤ 0.005% |
| Water Insoluble | ≤ 0.01% |
| Alkali and Alkaline Earth Metals | ≤ 0.02% |
SECTION 8: STANDARD SOLUTION PREPARATION
| Concentration | Preparation |
|---|---|
| 0.1 M Fe²⁺ | 39.2 g Mohr's salt → 1 L water (acidified) |
| 0.05 M Fe²⁺ | 19.6 g Mohr's salt → 1 L water (acidified) |
| 0.02 M Fe²⁺ | 7.84 g Mohr's salt → 1 L water (acidified) |
Note: Solutions should be acidified with dilute sulfuric acid (H₂SO₄) to prevent Fe²⁺ oxidation.
SECTION 9: STORAGE AND SHELF LIFE
| Parameter | Information |
|---|---|
| Storage Conditions | Cool (15-25°C), dry, well-ventilated area |
| Container Requirements | Tightly closed, original packaging |
| Protect From | Light, air (oxidation), moisture |
| Shelf Life | 24-48 months (unopened original packaging) |
| Stability Note | Slowly oxidizes in air; yellowish color indicates Fe³⁺ formation |
SECTION 10: PACKAGING OPTIONS
| Packaging Type | Quantity | Material |
|---|---|---|
| Plastic pail | 20-25 kg | HDPE |
| PE-lined kraft paper bag | 25 kg | Kraft paper + PE |
| Fiber drum | 25-50 kg | HDPE + PE |
| Glass bottle | 100-500 g | Amber glass |
| Aluminum foil bag | 1-5 kg | Laminated aluminum |
SECTION 11: SAFETY AND HEALTH INFORMATION
GHS Classification (Bulk Powder)
| Hazard Class | Category |
|---|---|
| Acute Toxicity (Oral) | Category 4 (H302) |
| Skin Irritation | Category 2 (H315) |
| Eye Irritation | Category 2A (H319) |
| Signal Word | Warning |
Hazard Statements (H-Codes)
| Code | Statement |
|---|---|
| H302 | Harmful if swallowed |
| H315 | Causes skin irritation |
| H319 | Causes serious eye irritation |
Precautionary Statements (P-Codes)
| Code | Statement |
|---|---|
| P261 | Avoid breathing dust |
| P280 | Wear protective gloves/eye protection |
| P301+P312 | IF SWALLOWED: Call a POISON CENTER/doctor if you feel unwell |
| P302+P352 | IF ON SKIN: Wash with plenty of soap and water |
| P305+P351+P338 | IF IN EYES: Rinse cautiously with water for several minutes; remove contact lenses if present and easy to do; continue rinsing |
SECTION 12: TOXICOLOGICAL INFORMATION
| Parameter | Value |
|---|---|
| Oral LD50 (Rat) | > 500 mg/kg |
| Skin Irritation | Irritant |
| Eye Irritation | Irritant |
| Carcinogenicity | Not classified |
| Mutagenicity | Negative in standard tests |
SECTION 13: FIRST AID MEASURES
| Exposure Route | Action |
|---|---|
| Inhalation | Move to fresh air. If respiratory irritation persists, seek medical attention. |
| Skin Contact | Wash with plenty of soap and water. Remove contaminated clothing. |
| Eye Contact | Rinse immediately with plenty of water for at least 15 minutes. Seek medical attention. |
| Ingestion | Rinse mouth. Do not induce vomiting. Seek medical attention. |
SECTION 14: REGULATORY STATUS
| Region / Authority | Status |
|---|---|
| European Union | REACH registered |
| USA (FDA) | Limited use as iron source |
| Turkey | Registered; subject to KKDİK regulations |
SECTION 15: TRANSPORT INFORMATION
| Parameter | Information |
|---|---|
| UN Number | Not regulated (not dangerous goods) |
| Hazard Class | Not applicable |
| Packing Group | Not applicable |
| ADR/RID | Not regulated |
| IMDG Code | Not regulated |
| IATA (Air) | Not regulated |
| Marine Pollutant | No |
SECTION 16: FIRE-FIGHTING MEASURES
| Parameter | Information |
|---|---|
| Fire Hazard | Non-combustible (inorganic salt) |
| Suitable Extinguishing Media | Water spray (mist), CO₂, dry chemical powder |
| Specific Hazards | When heated, emits toxic fumes (sulfur oxides, nitrogen oxides) |
| Decomposition Products | SOx, NOx, Fe₂O₃ |
| Protective Equipment | Self-contained breathing apparatus (SCBA), full protective clothing |
SECTION 17: ACCIDENTAL SPILLAGE AND CLEANUP
| Parameter | Information |
|---|---|
| Personal Protection | Nitrile gloves, protective goggles, dust mask (N95) |
| Cleaning Methods | Collect mechanically (sweep or spatula) |
| Environmental Precautions | Prevent entry into drains, soil, and surface waters |
| Waste Disposal | According to local regulations; landfilling at licensed facilities |
SECTION 18: OTHER NAMES AND SYNONYMS
| Type | Name |
|---|---|
| Turkish Names | Amonyum Demir Sülfat Hekzahidrat, Mohr Tuzu, Amonyum Ferro Sülfat |
| English Names | Ammonium Ferrous Sulfate Hexahydrate, Mohr's Salt, Ferroammonium Sulfate |
| Chemical Names | Diammonium iron(II) sulfate hexahydrate |
| CAS Number | 7783-85-9 |
| EC Number | 233-151-8 |
SECTION 19: SUMMARY AND CRITICAL NOTES
Product Summary
| Parameter | Value |
|---|---|
| Product | Ammonium Ferrous Sulfate Hexahydrate (Mohr's Salt) |
| CAS Number | 7783-85-9 |
| Appearance | Blue-green to light green crystals |
| Molecular Weight | 392.14 g/mol |
| Primary Function | Analytical standard, laboratory reagent |
| Iron Content | ~14.2% |
Critical Notes
-
Primary Standard: Mohr's salt is used as a primary standard in redox titrations (permanganate, dichromate).
-
Stable Fe²⁺ Source: Stabilized by ammonium sulfate; more stable than other Fe²⁺ salts.
-
Oxidation: Slowly oxidizes to Fe³⁺ in air; yellowish color indicates oxidation.
-
Solution Preparation: Solutions should be acidified with dilute H₂SO₄ to prevent Fe²⁺ oxidation.
-
Crystal Water: Contains 6 molecules of crystal water (27.6%); loses water at 100-110°C.
-
Fricke Dosimetry: Used for high-dose gamma ray measurement.
-
Medical Use: Used as antianemic agent for iron deficiency anemia treatment.
-
Solubility: Highly soluble in water; insoluble in ethanol.
-
Shelf Life: 24-48 months in closed packaging.
-
Regulatory Status: REACH registered; not classified as dangerous goods.
IMPORTANT DECLARATION: This Technical Data Sheet (TDS) is for informational purposes only and has been prepared based on available technical data. The user is responsible for determining the product's suitability for their specific application and for complying with all local, national, and international regulations. For complete safety, storage, use, transport, waste, and regulatory compliance information, refer to the official Safety Data Sheet (SDS/MSDS) provided by the manufacturer/supplier.
