Manganese (ii) sulfate tetrahydrate
| Chemical formula | MnO4S*4H2O |
| Density | 2.11 g/cm3 |
| Molar mass | 223.06 g/mol |
| HS Code | 28332990 |
| CAS number | 10101-68-5 |
| Storage | Store at 15 to 25 °C |
| EC number | 232-089-9 |
| SDS | available |
| RTECS | OP1200000 |
| R phrase | R 48/20/22-51/53 |
| S phrase | S 22-61 |
| Odour | odourless |
| Form | solid |
| Color | pink |
| p H value | 4.5-6.0 (100 g/l 20°C) |
| Solubility in water | freely soluble (20°C) |
| Solubility in ethanol | insoluble |
| Melting point | 26 – 27 °C |
| Thermal decomposition | 850 °C |
| Assay | ≥ | 98.5 | % |
| Description | Conforms | ||
| Identification | Conforms | ||
| Solubility | Conforms | ||
| In water insoluble matter | ≤ | 0.003 | % |
| p H | 4.5 to 6.0 | ||
| Chloride | ≤ | 0.001 | % |
| Calcium | ≤ | 0.005 | % |
| Copper | ≤ | 0.0002 | % |
| Iron | ≤ | 0.0005 | % |
| Potassium | ≤ | 0.002 | % |
| Magnesium | ≤ | 0.01 | % |
| Sodium | ≤ | 0.005 | % |
| Nickel | ≤ | 0.002 | % |
| Lead | ≤ | 0.0002 | % |
| Zinc | ≤ | 0.002 | % |
| Substances reducing kMnO4 | ≤ | 0.0005 | % |
| Oxydizing matter | ≤ | Conforms | % |
| Reducing substances | ≤ | 0.0065 | % |
Manganese(II) sulfate tetrahydrate is a pale pink, crystalline inorganic salt that serves as a vital source of manganese for industrial, agricultural, and laboratory applications. It is commonly encountered in hydrated form and is highly soluble in water.
🏭⚗️ Production
Manganese(II) sulfate tetrahydrate is typically produced by the reaction of manganese dioxide (MnO₂) or manganese carbonate (MnCO₃) with sulfuric acid. The resulting solution of manganese sulfate is filtered to remove insoluble impurities and then crystallized under controlled conditions to yield the tetrahydrate form. It may also be obtained as a byproduct from the processing of manganese ores.
🔬 Properties
The chemical formula of manganese(II) sulfate tetrahydrate is MnSO₄·4H₂O, with a molar mass of approximately 169.01 g/mol. It appears as pink to light red crystals and is odorless. The compound is highly soluble in water but insoluble in alcohol. It decomposes upon heating, losing water and eventually forming manganese oxides. It is stable under normal storage conditions and mildly acidic in aqueous solution. The pink color is characteristic of Mn²⁺ ions in hydrated environments.
🧪 Applications
Manganese(II) sulfate tetrahydrate is widely used as a micronutrient in fertilizers and animal feeds, providing essential manganese for plant and animal metabolism. In the chemical industry, it is used in the production of other manganese compounds, including manganese dioxide for batteries. It is also employed in ceramics, dyeing, and printing processes. In laboratory settings, it is used as a precursor in coordination chemistry and for analytical purposes involving manganese.
⚠️ Safety
Manganese(II) sulfate tetrahydrate should be handled with care, as excessive exposure to manganese compounds—especially in dust form—can be harmful. Inhalation or ingestion over prolonged periods may lead to manganism, a neurological condition. The solid and its solutions may irritate the eyes, skin, and respiratory tract. Appropriate personal protective equipment such as gloves, goggles, and dust masks should be used. It should be stored in a cool, dry, and well-ventilated area, away from strong oxidizing agents.
