HSO4⁻ refers to bisulfate ion, which consists of one hydrogen atom bonded to one sulfate group (-HSO4). It acts as both an acid and weak base depending on its surroundings.
Related terms
Acid: Acid is a substance that donates protons or accepts pairs of electrons.
Conjugate Base: Conjugate Base is the species formed by removing a proton from an acid.
Proton Donor: Proton Donor is another term for an acid.