What is the pH range of an acid?

The pH range of an acid is from 0 to 6. This range indicates that acids have a higher concentration of hydrogen ions (H⁺) compared to neutral substances, which have a pH of 7. A pH of less than 7 signifies that the solution is acidic, with lower values reflecting stronger acids.

For example, a strong acid like hydrochloric acid can have a pH close to 0, while weaker acids such as vinegar might have a pH around 4 to 5. In contrast, a pH of 7 is considered neutral, indicating neither acidic nor basic properties, while values above 7 signify basic or alkaline substances. A pH range above 6 does not accurately represent acidic conditions, and therefore does not correctly classify what constitutes an acid.