What term describes a substance with a pH value of less than 7 and has more H+ ions than OH- ions?

A substance with a pH value of less than 7 is classified as acidic. The key characteristic of acids is their tendency to have a higher concentration of hydrogen ions (H+) compared to hydroxide ions (OH-). This imbalance towards H+ ions gives the substance its acidic properties.

In contrast, neutrality refers to a pH of exactly 7, indicating an equal concentration of H+ and OH- ions. Alkalinity and basicity are terms used to describe substances with a pH greater than 7, where the concentration of OH- ions exceeds that of H+ ions. Therefore, "acidity" is indeed the correct term in this context, as it directly relates to the condition where a solution is acidic by virtue of having a lower pH and a higher concentration of H+ ions.