What range on the pH scale represents acids?

• A. 0-6.9
• B. 7-7.9
• C. 8-14
• D. Neutral at 7 only

Answer: (A)

The range on the pH scale that represents acids is indeed from 0 to 6.9. Acids are characterized by their ability to donate hydrogen ions (H+) in solution, which results in a lower pH value. A pH of 7 is considered neutral, meaning it is neither acidic nor basic. Values below 7 indicate increasing acidity, with 0 being the most acidic. Therefore, the range from 0 to 6.9 encompasses various strengths of acids, making it the correct choice.

In contrast, a pH range of 7-7.9 indicates a mildly basic or neutral solution, while 8-14 represents stronger bases. The assertion that neutral is at 7 only does not encompass the concept of acidity at all. Thus, identifying the correct range for acids involves recognizing that they fall within the lower end of the pH scale.