Barium nitrate, with the chemical formula Ba(NO3)2, is a chemical compound composed of barium (Ba) cations and nitrate (NO3-) anions. It is a white crystalline solid that is highly soluble in water.

Some key properties and uses of barium nitrate include:

1. Pyrotechnics: Barium nitrate is a common ingredient in green-colored fireworks and pyrotechnic compositions. When heated, it releases green light, producing the characteristic green color in fireworks displays.
2. Specialty Glass Manufacturing: It is used in the production of certain specialty glasses, such as for optical lenses and in certain glass-ceramic materials.
3. Rat Poison: Historically, barium nitrate was used as a rat poison due to its toxicity. However, its use as a pesticide has been restricted or banned in many countries due to environmental and health concerns.
4. Explosives: Barium nitrate is used in some explosives formulations, particularly in combination with other compounds.
5. Chemical Reagent: Barium nitrate is used as a chemical reagent in various chemical reactions and laboratory studies.

Barium nitrate is toxic if ingested, inhaled, or absorbed through the skin, and it should be handled with care. It is also considered harmful to the environment, and its release into water bodies and the environment should be avoided.

As with any chemical, safety precautions should be taken when handling barium nitrate. It is essential to work with this compound in a well-ventilated area and use appropriate personal protective equipment to minimize exposure and potential risks. Additionally, proper waste disposal procedures should be followed to prevent environmental contamination.

Due to its potential hazards and toxicity, the use of barium nitrate is regulated in many countries, especially in applications such as rat poisons, where it has been largely replaced by safer alternatives.