Sodium benzoate is a substance which has the chemical formula C₆H₅COONa. What Is Sodium Benzoate? Sodium benzoate is best known as a preservative used in processed foods and beverages to extend shelf life, though. If you Google “sodium benzoate”, prepare yourself for a firehose of stupidity. Sodium benzoate is used as a preservative in jams and jelly. Sodium benzoate | C6H5COONa or NaC6H5COO or C7H5O2Na or C7H5NaO2 | CID 517055 - structure, chemical names, physical and chemical properties,.