What is BaSeO3? Important knowledge about BaSeO3.

1. Definition of BaSeO₃
   BaSeO₃, also known as Barium Selenite, is a type of chemical compound consisting of the elements Barium (Ba), Selenium (Se), and Oxygen (O). The atomic mass of BaSeO₃ is 264.23 g/mol, which is composed of 1 atom of Barium, 1 atom of Selenium, and 3 atoms of Oxygen. The structure of the BaSeO₃ ion includes the Ba₂+ ion and the SeO₃₂- ion.

2. Properties: BaSeO₃
   BaSeO₃ is a solid, colorless, odorless, and insoluble in water. In terms of chemical properties, BaSeO₃ can react with strong acids to form salts and water.

3. Common chemical equations with BaSeO₃
   Since BaSeO₃ is a type of salt, it can participate in chemical reactions such as ion exchange reactions. For example, when reacting with HCl acid, BaSeO₃ will form BaCl₂ salt and H₂SeO₃ acid.

BaSeO₃ + 2HCl -> BaCl₂ + H₂SeO₃

4. Preparation of BaSeO₃
   BaSeO₃ can be prepared in the laboratory through the reaction between Barium Chloride (BaCl₂) and Sodium Selenite (Na₂SeO₃).

BaCl₂ + Na₂SeO₃ -> BaSeO₃ + 2NaCl

On an industrial scale, BaSeO₃ is usually produced by dissolving Barium in hot Selenic acid (H₂SeO₄).

Note: Barium Selenite is a toxic substance, so caution should be taken when handling this compound.