* Acidity is measured by pH: A lower pH indicates a higher hydrogen ion (H+) concentration.
* Dilution: Adding water dilutes the solution, meaning the same amount of H+ ions is now spread out over a larger volume.
* Reduced Concentration: This dilution directly leads to a lower concentration of H+ ions per unit volume.
In simpler terms: Imagine you have a glass of orange juice (acidic). If you add more water to the glass, the orange juice becomes less concentrated, and its acidity decreases. The same principle applies to any acidic solution.
