The chemical formula for hydrogen sulfite is HSO3-. An ion of hydrogen sulfite is made up of one atom of hydrogen, represented by H, three atoms of oxygen, represented by O3 and one atom of sulfur, represented by S. The ion has a net ionic charge of negative one.
The ion is most commonly known as bisulfite, and may also be known as sulfonic acid and hydrosulfite anion. It has a molar mass of 81.07 grams per mole. It is commonly found in salts known generally as sulfite lyes or bisulfites, such sodium bisulfite. It is often added to epinephrine to deter oxidation to adrenochrome.