What pH range is considered acidic?

An acidic solution is one that has a pH level less than 7. The scale for pH ranges from 0 to 14, where 7 is neutral. Any pH value below 7 indicates acidity, with lower pH values representing stronger acids. The choice indicating a pH range of 0 to 6 effectively captures all values that represent acidity, making it the appropriate selection. Values within this range, particularly those closer to 0, denote increasing acidity.

The other options do not adequately describe the range of acidity. The range from 0 to 4 would indeed include very strong acids, but it is too narrow to encompass all acidic solutions. The range from 5 to 7 includes neutral (7) and slightly basic (above 7) conditions, and the range from 7 to 14 describes basic (alkaline) conditions entirely, which aligns with the opposite end of the pH scale. Thus, the range of 0 to 6 is the best reflection of acidity in a solution.