Washington Esthetician State Board Practice Exam

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What is the pH range of an acid?

A substance with a pH of 0 to 7
A substance with a pH of 6 to 8
A substance with a pH of 7 to 14
A substance with a pH below 7.0

The correct answer is: A substance with a pH below 7.0

The pH scale measures the acidity or alkalinity of a substance, ranging from 0 to 14. A substance is considered acidic when it has a pH value below 7. This indicates a higher concentration of hydrogen ions, which is characteristic of acids. For clarity, the scale is structured so that 0 is highly acidic, 7 is neutral (like pure water), and 14 is highly alkaline. Therefore, any pH value below 7 signifies an acidic environment. This understanding is crucial for estheticians, as many skincare products have varying pH levels that can affect the skin's health and reaction. Recognizing this aspect is fundamental in making informed choices in product selection and treatments.