Colorado Cosmetology Written Practice Exam 2026 - Free Cosmetology Practice Questions and Study Guide

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Which pH is considered neutral on the pH scale?

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7

The neutral point on the pH scale is defined as a pH of 7. This is significant because it represents a balance between acidity and alkalinity. In terms of chemistry, a solution with a pH of 7 has an equal concentration of hydrogen ions (H+) and hydroxide ions (OH-), making it neutral.

In contrast, a pH lower than 7 indicates an acidic solution, where there are more hydrogen ions than hydroxide ions, while a pH higher than 7 indicates a basic (alkaline) solution, where there are more hydroxide ions than hydrogen ions. Understanding that pH 7 is neutral is crucial for cosmetologists, as many hair and skin products are formulated to maintain pH around this level to prevent irritation and ensure efficacy. This knowledge helps in selecting the right products for varying hair and skin types, ensuring optimal results in treatments.

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