Barrons SAT Subject Test Chemistry, 13th Edition

38. (D) An amphoteric substance must be able to be a proton, (H+), donor, and a

proton receiver. The bisulfate ion, HSO 4 −, is the only choice that can either

accept a proton and become H 2 SO 4 , or lose a proton and become the sulfate

ion, SO 4 2−.