Phosphoric acid and phosphorous acid are often investigated. Although both involve phosphorus elements, their properties, structures and uses are different.

Phosphoric acid, the chemical formula is\ (H_ {3} PO_ {4}\). In its molecular structure, the phosphorus atom is in the center, connected to four oxygen atoms, of which three oxygen atoms are bonded to hydrogen atoms. This structure gives phosphoric acid a medium-strong acidity. In the industrial field, phosphoric acid is widely used. In the food industry, it can be used as a food additive to adjust the acidity of food. For example, in common carbonated beverages, the appropriate amount of phosphoric acid can give a unique sour taste and refreshing taste, and can prevent the growth of microorganisms and prolong the shelf life. In agriculture, phosphoric acid is a key raw material for the production of phosphorus fertilizers. Phosphorus fertilizers provide essential phosphorus elements for plant growth, promote root development, and enhance crop resistance. It is of great significance to improve crop yield and quality.

In contrast, phosphorus, the chemical formula is\ (H_ {3} PO_ {3}\). Its molecular structure is different from phosphoric acid. The phosphorus atom is connected to three oxygen atoms, one of which is connected to the phosphorus by a double bond, and the other two oxygen atoms are bonded to the hydrogen atom. Therefore, phosphorus is a dibasic acid. Phosphoric acid has strong reducing properties, which makes it significant in the field of chemical synthesis. For example, it can be used to prepare other phosphorus-containing compounds and participate in many reactions as a reducing agent in organic synthesis, helping to generate organic products with specific structures.

Phosphoric acid and phosphoric acid have different properties such as acidity and redox properties due to structural differences, which determine their different uses in various fields. Identifying the differences between the two is of great significance in chemical research, industrial production and related applications, and prompts various industries to make rational use of their characteristics to promote scientific and technological progress and industrial development.