What is ceric ammonium nitrate?
Ceric ammonium nitrate is an orange-red monoclinic fine-grained crystal. Ceric ammonium nitrate is easily soluble in water and ethanol. At 25°C, the solubility in water is 141g/100ml, and at 80°C, it is 227g/100ml. It is almost insoluble in concentrated nitric acid. The melting point of ceric ammonium nitrate is 107 - 108°C, and the density is 2.2g/cm³ (at 20°C). Ceric ammonium nitrate is deliquescent in air.
From the aspect of chemical properties, ceric ammonium nitrate is a strong oxidant. Under acidic conditions, its oxidizing property is more significant. In aqueous solutions and other protic solvents, as a single-electron oxidant, the change in color from orange-red to light yellow can intuitively judge its consumption in chemical reactions. This characteristic makes it an important reagent in redox reactions and provides a powerful tool for chemical research and industrial production.
Precautions for use
When using ceric ammonium nitrate, we must also pay attention to relevant safety precautions. Since it is a strong oxidant, when in contact or mixed with organic substances, reducing agents, and flammable substances such as sulfur and phosphorus, there is a risk of combustion and explosion. When decomposed by high heat, it will release toxic gases. Therefore, safety regulations must be strictly followed during storage and use. In case of a leak, immediately isolate the contaminated area, restrict access, and cut off the fire source. Emergency responders should wear dust masks and gas-proof clothing and handle the leaked substance carefully. For a small leak, it can be covered with dry lime, sand, or soda ash, and then collected in a dry, clean, and covered container with a clean shovel; for a large leak, it needs to be collected and recycled or transported to a waste disposal site for treatment. During operation, it should be operated in a closed manner to ensure comprehensive ventilation and prevent dust from being released into the workshop air. Operators must receive specialized training and strictly follow operating procedures. It is recommended to wear self-absorbing filter dust masks, chemical safety goggles, rubberized gas-proof clothing, and chemical-resistant gloves. At the same time, stay away from fire sources and heat sources. Smoking is strictly prohibited in the workplace to avoid generating dust and contact with reducing agents and active metal powders. Appropriate types and quantities of fire-fighting equipment and leakage emergency treatment equipment should also be provided. When storing, ceric ammonium nitrate should be stored in a cool and ventilated warehouse, away from fire sources and heat sources, and protected from direct sunlight with sealed packaging. It should be stored separately from reducing agents, active metal powders, and edible chemicals. Do not store them together. And appropriate types and quantities of fire-fighting equipment should be provided, and the storage area should be equipped with suitable materials to contain leaked substances.
In which fields is ceric ammonium nitrate applied?
- Used for the determination of trace silver ions.
- As a redox titrant.
- Used as a catalyst for olefin polymerization.
- Used as an analytical reagent, often used to prepare redox titration standard solutions, as a color developer for detecting polyols by thin-layer chromatography, as a raw material for preparing phosphate-sensitive membrane electrode compositions, and as a reagent for potentiometric titration to determine various amines.