Sodium bisulfite has a wide range of synonyms, and it is commonly referred to as sodium hydrogen sulfite. It is also known as sodium bisulfate, sodium acid sulfite, and sodium hydrogen sulfate. These synonyms are used interchangeably to refer to the compound, which is a sodium salt of sulfurous acid. Sodium bisulfite is a reactive compound that is used in many industrial processes, such as food preservation, water treatment, and photography. It is also used in medicine as a reducing agent and as a source of sulfites. Its various synonyms reflect its versatile nature and the many applications for which it is used.