What is H2Cr3O8? Important Knowledge about H2Cr3O8

1. Definition of H₂Cr₃O₈

H₂Cr₃O₈, commonly known as chromic acid or trihydrate chromic acid. In English, it is referred to as Chromic acid. This is a chemical compound with the molecular structure of H₂CrO₄.xH2O, in which x ranges from 0 to 2. Its molecule consists of 2 hydrogen atoms, 3 chromium atoms, and 8 oxygen atoms. Each chromium atom in the H₂Cr₃O₈ molecule is bonded with 4 oxygen atoms to form an octahedral structure. It forms the ions CrO₄^2- and H^+ in aqueous solution.

2. Properties: H₂Cr₃O₈

2.1 Physical Properties of H₂Cr₃O₈: Chromic acid usually appears as a brownish-red or dark red powder. It is odorless and has a low PH, indicating strong acidity.

2.2 Chemical Properties of H₂Cr₃O₈: Chromic acid is very strong, it can react with many metals and non-metals to form chromate and dichromate salts. It can also react with other acids to form salts and water.

3. Common chemical equations involving H₂Cr₃O₈: Due to the strong acid nature of H₂Cr₃O₈, it often reacts with metals, nonmetals, acids, and bases. Specifically, these need to be directly studied on each individual substance.

4. Preparation of H₂Cr₃O₈

4.1 Laboratory preparation of H₂Cr₃O₈: Chromic acid is usually prepared by reacting chromate or dichromate with a strong acid such as sulfuric acid in the laboratory.

4.2 Industrial preparation of H₂Cr₃O₈: In industry, chromic acid is produced by oxidizing chromium with nitric acid.