What is the pH range of acidic solutions?

The pH scale ranges from 0 to 14, where 7 is considered neutral. Solutions with a pH value less than 7 are classified as acidic. Therefore, the pH range for acidic solutions falls below 7. This means that any value that is less than 7 indicates an acidic nature. Understanding the pH scale is essential in cosmetology because it affects the properties and reactions of various products used in hair and skin care.

The other options provide ranges that do not accurately define the entire scope of acidic solutions. For example, being below 5 or below 6 would only encompass part of the acidic range, which is more expansive. Thus, stating that acidic solutions are those with a pH below 7 encompasses all acidic solutions up to 0 and is the most comprehensive choice.