Iowa Cosmetology Practice Exam

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What is the pH range of hair?

3.0 to 4.0
4.5 to 5.5
5.5 to 6.5
6.0 to 7.5

The correct answer is: 4.5 to 5.5

The pH range of hair is typically between 4.5 and 5.5, which is slightly acidic. This acidity helps to maintain the hair's health and integrity. The slightly acidic environment prevents the cuticle layer of the hair from lifting, which can lead to damage and moisture loss. When hair products, such as shampoos and conditioners, are formulated, they often aim to match this pH level to ensure that they are gentle on the hair and to prevent any adverse effects that might arise from more alkaline formulations. Staying within this pH range is essential for promoting shine, strength, and overall hair health.