What is H2C2O4? Important knowledge about H2C2O4.

1. Definition of H₂C₂O₄
   H₂C₂O₄, also known as oxalic acid or axit oxalic in Vietnamese, is a colorless solid with a distinctive sour taste. H₂C₂O₄ has an atomic weight of 90.03 g/mol. The H₂C₂O₄ molecule consists of 2 hydrogen atoms, 2 carbon atoms, and 4 oxygen atoms. In this compound, carbon creates two carboxyl groups with oxygen, thereby forming a form of dicarboxylic acid. When ionized, H₂C₂O₄ can form two H+ ions and one C₂O₄^2- ion.

2. Properties
   2.1 Physical properties of H₂C₂O₄
   Oxalic acid is a solid, colorless, sour substance with a low PH level.

2.2 Chemical properties of H₂C₂O₄
H₂C₂O₄ can react with metals and non-metals to form oxalate salts, and it can also react with acids to form water and CO₂ gas.

3. Common chemical equations of H₂C₂O₄
   Examples of some common reactions of H₂C₂O₄ include reactions with metals such as Na, K, Mg to form oxalate salts and release hydrogen. It can also react with strong acids such as HCl, H₂SO₄ to form water and CO₂ gas.

4. Synthesis of H₂C₂O₄
   4.1 Laboratory synthesis of H₂C₂O₄
   In the laboratory, H₂C₂O₄ is usually synthesized by oxidizing glucose or sucrose with nitric acid under high temperature conditions.

4.2 Industrial synthesis of H₂C₂O₄
On an industrial scale, H₂C₂O₄ is typically produced by oxidizing CO or CO₂ with nitric acid under high temperature and environmental pressure conditions.