The chemical formula for hydrogen sulfate is HSO4-. The formula indicates that an ion of hydrogen sulfate contains one atom of hydrogen, one atom of sulfur and four atoms of oxygen. The ion carries a total charge of -1.
Hydrogen sulfate may also be known as bisulfate. It is formed when sulfuric acid is ionized in an aqueous solution, making it the conjugate base of the acid. The ion has a molar mass of around 97.07 grams per mole. Hydrogen sulfate can combine with other ions to form molecules, such as sodium sulfate, potassium hydrogen sulfate and ammonium hydrogen sulfate.