The chemical formula for the bisulfate ion is HSO₄⁻.
Bisulfate is derived from sulfuric acid and is often referred to as hydrogen sulfate. The presence of the hydrogen atom (H) signifies that it is a bisulfate species rather than sulfate (SO₄²⁻).
The charge on the bisulfate ion is -1. This happens because when sulfuric acid loses a proton (H⁺), it becomes bisulfate, carrying a negative charge due to the additional negative charge from the sulfate ion, which originally has a -2 charge. Thus, the H⁺ ion balances the charge to -1.