Which of the following pH values would be classified as mildly acidic?

A pH value of 6 is considered mildly acidic because it falls just below neutral pH, which is defined as 7. The pH scale operates from 0 to 14, where values lower than 7 indicate acidity and those higher than 7 indicate alkalinity (or basicity). A pH of 6 suggests that the solution has slightly higher concentrations of hydrogen ions (H⁺) than pure water (which has a pH of 7), making it mildly acidic.

In the context of the pH scale, a pH of 3 is classified as strongly acidic, indicating a significantly higher concentration of hydrogen ions. Conversely, a pH of 10 is basic, indicating the solution has lower hydrogen ion concentration compared to water. Finally, a pH of 14 signifies a highly alkaline solution. Thus, a pH of 6 is the only value that correctly represents a mildly acidic condition.