On the pH scale, what range indicates an acid?

The range that indicates an acid on the pH scale is from 0 to 6.9. This is because pH values below 7 are considered acidic, and the lower the pH value, the stronger the acid. In the context of cosmetology, understanding pH is essential since many hair and skin products may have acidic, neutral, or alkaline properties based on their pH levels. Products with a pH in this range (between 0 and 6.9) can effectively help balance skin and hair conditions that require acidity, such as controlling oiliness or enhancing shine in hair treatments.

While other specified ranges on the scale represent neutral (7) or alkaline (above 7) properties, they do not fall within the defining criteria for acidic substances. Thus, recognizing the pH spectrum helps cosmetologists choose the right products for their clients’ specific needs.