On which side of the pH scale does one find more H+ ions than OH- ions?

The side of the pH scale that has more H+ ions than OH- ions is characterized as acidic. In an acidic solution, the concentration of hydrogen ions (H+) exceeds that of hydroxide ions (OH-). This results in a pH value that is less than 7.

For instance, common acidic substances, such as lemon juice or vinegar, will have pH values significantly lower than 7, which reflects their higher concentration of H+ ions compared to OH- ions. This relationship is foundational in understanding how acids behave and interact in biological and chemical systems, leading to various physiological effects and processes.

In contrast, as one moves toward higher pH values (above 7), the solution becomes basic or alkaline, where the concentration of OH- ions is greater than that of H+ ions. Neutral solutions (like pure water) have equal concentrations of H+ and OH- ions, resulting in a pH of 7. Thus, acidic solutions are distinct in that they have a predominance of H+ ions, which is what makes them more chemically reactive and impactful in various biological contexts.