آلومینیوم نیترات نوناهیدرات
| Formula | AlN3O9*9H2O |
| Chemical formula | Al(NO3)3*9H2O |
| Molar mass | 375.13 g/mol |
| Bulk density | ~ 880 kg/m3 |
| CAS number | 7784-27-2 |
| HS Code | 28342980 |
| EC number | 236-751-8 |
| Storage | Without limitation |
| SDS | available |
| R phrase | R 8-36/38 |
| Odour | of nitric acid |
| Form | solid |
| Color | colourless |
| p H value | 2.0 – 4.0(50 g/l 20 °C) |
| Solubility in water | 419 g/l (20°C) |
| Solubility in ethanol | freely soluble(20°C) |
| Melting point | 73 °C |
| Thermal decomposition | 135 °C |
| Assay | ≥ | 95 | % |
| Description | Conforms | ||
| Identification | Conforms | ||
| Solubility | Conforms | ||
| Chloride | ≤ | 0.005 | % |
| Sulfate | ≤ | 0/03 | % |
| Iron | ≤ | 0/01 | % |
| Heavy metals | ≤ | 0/005 | % |
| Substances not precipitated by | ≤ | 0/5 | % |
| ammonia |
Aluminium nitrate nonahydrate is a white, crystalline, water-soluble inorganic compound commonly used as a source of aluminium ions in laboratory and chemical processes. It is valued for its high solubility, oxidative potential, and controlled decomposition properties in both research and pharmaceutical applications.
🏭⚗️ Production
It is typically produced by reacting aluminium hydroxide, aluminium metal, or aluminium oxide with nitric acid under controlled conditions. The resulting solution is then concentrated and cooled to crystallize aluminium nitrate in its nonahydrate form, containing nine molecules of water of crystallization per formula unit.
🔬 Properties
The chemical formula is Al(NO₃)₃·9H₂O, with a molar mass of approximately 375.13 g/mol. It appears as white, odorless, hygroscopic crystals that dissolve readily in water and ethanol. The solution is acidic and acts as a mild oxidizer. The compound decomposes upon heating to produce nitrogen oxides, aluminium oxide, and water vapor. It should be handled carefully due to its oxidizing nature and sensitivity to heat and moisture.
🧪 Applications
In laboratory use, aluminium nitrate nonahydrate serves as a reagent in synthesis reactions, especially where controlled aluminium ion release is required. It is used in the preparation of catalysts, nanomaterials, and ceramics. In pharmaceutical contexts, it may be used in the synthesis of aluminium-based compounds for topical formulations, under strict regulation. It is also utilized in the controlled precipitation of aluminium hydroxide in formulations requiring specific pH adjustment or ionic strength.
⚠️ Safety
Aluminium nitrate nonahydrate is classified as an oxidizing agent and should be stored away from flammable or reducing materials. Contact with eyes, skin, or inhalation of dust may cause irritation. Adequate personal protective equipment—gloves, goggles, and masks—should be used during handling. It must be stored in tightly sealed containers in a cool, dry place, away from heat sources and incompatible substances.
