Sodium citrate is a salt of citric acid. It is also known as trisodium citrate and has the chemical formula Na3C6H5O7. It is commonly used as a food additive and is often found in processed foods and soft drinks. This is also used in the pharmaceutical industry as a buffer and a chelating agent. Sodium citrate has several properties that make it useful in various applications. It has a sour taste and can be used as a flavoring agent.