Final answer:
An aqueous solution of sulfuric acid contains predominantly HSO4- ions over SO42- ions because sulfuric acid ionizes in two stages and the second stage of ionization is not as complete as the first.
Step-by-step explanation:
The statement 'Although sulfuric acid is a strong electrolyte, an aqueous solution of H2SO4 contains more HSO4- ions than SO42- ions' can be understood by examining the ionization stages of sulfuric acid. Sulfuric acid is a strong diprotic acid that ionizes in water in two stages. The first stage of ionization is nearly complete, where H2SO4 loses one proton to form HSO4-. This first dissociation is strong, resulting in a high concentration of HSO4- ions. The second stage, where HSO4- loses another proton to form SO42-, is not as complete, making HSO4- a moderately strong acid but not fully ionized like the first stage. The given dissociation constants (Ka) indicate that in a solution predominantly HSO4- ions are present compared to SO42- ions.