Final answer:
Hydronium dominates sulfuric acid in water due to its higher concentration resulting from the ionization of the acid. Sulfuric acid is a strong acid that fully dissociates, leading to a higher concentration of hydronium ions in water.
Step-by-step explanation:
Compared with pure water, a solution of acid exhibits a higher concentration of hydronium ions (due to ionization of the acid) and a proportionally lower concentration of hydroxide ions. This may be explained via Le Châtelier's principle as a left shift in the water autoionization equilibrium resulting from the stress of increased hydronium ion concentration.
It is important to note that sulfuric acid is a strong acid and fully dissociates in water, resulting in a higher concentration of hydronium ions than other weaker acids. Therefore, hydronium dominates sulfuric acid in water due to its higher concentration.