On the Differences between Phosphoric Acid and Phosphoric Acid
All things in the world have their own unique characteristics, and chemical substances are no exception. Although the difference between Phosphoric Acid and Phosphorous Acid is only one word, there are significant differences in their properties and uses.

Phosphoric Acid, its chemical formula is $H_3PO_4 $, and its appearance is often colorless, transparent and viscous liquid or white crystals. It has the properties of medium and strong acid, can be ionized in steps in water, and is widely used in industrial fields. In the food industry, it is often used as a food additive, such as in beverages, which can adjust the taste and acidity and give the drink a unique flavor; in agriculture, it is a key raw material for the production of phosphorus fertilizers, providing an indispensable phosphorus element for plant growth, which is of great significance for the growth of crops and the improvement of yield and quality; in metal surface treatment processes, it can be used for rust removal. By chemically reacting with rust, rust on the metal surface can be effectively removed to ensure the quality and service life of metal products.

Phosphoric acid, with a chemical formula of $H_3PO_3 $, is a colorless crystal and has hygroscopicity. Its acidity is slightly stronger than that of phosphoric acid, which is a binary acid. Phosphoric acid has strong reducing properties, which is an important characteristic different from phosphoric acid. In the field of organic synthesis, it is often used as a reducing agent to participate in many organic chemical reactions and help synthesize various organic compounds. In water treatment, it can be used to remove heavy metal ions in water and convert heavy metal ions into precipitation through chemical reactions to achieve water purification.

Phosphoric acid and phosphoric acid. In terms of structure, phosphorus atoms in phosphoric acid molecules are connected to four oxygen atoms, one of which is connected to phosphorus in the form of double bonds, and the other three oxygen atoms are combined with hydrogen atoms to form hydroxyl groups. In phosphorous acid molecules, phosphorus atoms are connected to three oxygen atoms, one of which is connected to phosphorus in the form of double bonds, one hydrogen atom is directly connected to phosphorus atoms, and the other two oxygen atoms are combined with hydrogen atoms to form hydroxyl groups. Structural differences make the properties and uses of the two different.

Although both contain phosphorus elements, phosphoric acid mostly exhibits acid-related properties and uses, and phosphoric acid, in addition to acidity, has particularly outstanding reducing characteristics. In-depth understanding of the two is of great significance for the development of chemical, agricultural, food and many other industries, laying a solid foundation for the rational use of chemical substances in various fields and promoting technological progress.