* Sulfuric acid (H₂SO₄) is a strong acid: This means it fully ionizes in water, releasing all its hydrogen ions (H⁺).

* Dilution adds more water: This effectively spreads out the existing hydrogen ions over a larger volume of solution.

* Lower concentration: As the volume of solution increases while the number of H⁺ ions stays the same, the concentration of H⁺ ions decreases.

In simpler terms: Imagine you have a fixed amount of sugar (H⁺ ions) in a glass of water. If you add more water (dilute it), the sugar becomes less concentrated in the solution.

Important note: While dilution decreases the hydrogen ion concentration, sulfuric acid remains a strong acid. Even in diluted solutions, it will still be highly acidic compared to other acids.