Final answer:
The name of the HSO4- ion is hydrogen sulfate, which is the conjugate base of sulfuric acid and the conjugate acid of the sulfate ion.
Step-by-step explanation:
The name of the HSO4- ion is hydrogen sulfate. This species is the conjugate base of sulfuric acid (H2SO4), and can act as either an acid or a base, making it an amphoteric compound. It is also the conjugate acid of the sulfate ion (SO42-). Therefore, the correct answer is (C) hydrogen sulfate.