1. Mainly used as an acidulant in food, and also for the preparation of pharmaceutical cooling agents, detergent additives, etc.
2. Used as a laboratory reagent, chromatographic analysis reagent and biochemical reagent, and also for the preparation of buffer solutions. It is used in the food industry, especially as an acidulant, pH buffer, and together with other compounds as a preservative. In the detergent industry, it is an ideal substitute for phosphates. It serves as an acid cleaning agent and a rinsing agent for boiler chemical cleaning. It is mainly used as an acidulant in food, and also for the preparation of pharmaceutical cooling agents and detergents.
3. Citric acid is the most versatile and widely used acidulant. It has high solubility and strong chelating ability for metal ions, and can be used in various foods in appropriate amounts according to production needs. In addition, this product can also be used as an antioxidant synergist, a synergist for compound potato starch bleaching agents and a preservative.
4. Widely used as an acidulant in food and beverages and a pharmaceutical additive. It can also be used as a raw material and additive for cosmetics, metal cleaning agents, mordants, non-toxic plasticizers and boiler scale inhibitors. Its main salt products include sodium citrate, calcium citrate and ammonium citrate, etc. Sodium citrate is a blood anticoagulant, and ammonium ferric citrate can be used as a blood-tonic drug.
5. Used as an analytical reagent.
6. Same as citric acid.

Anhydrous citric acid is known as the number one edible acidulant and is permitted in my country under GB2760-1996 as a food acidifier. It is widely used in the food industry as an acidulant, solubilizer, buffer, antioxidant, deodorant, chelating agent, and many other applications.