Milady Cosmetology Practice Exam

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What is the range of numbers used in the pH scale?

0 to 10
0 to 14
1 to 12
1 to 14

The correct answer is: 0 to 14

The pH scale measures the acidity or alkalinity of a solution, and it typically ranges from 0 to 14. A pH of 7 is considered neutral, indicating that a solution is neither acidic nor basic. Values lower than 7 represent acidic solutions, with 0 being the most acidic, while values above 7 indicate basic (alkaline) solutions, with 14 being the most alkaline. The standard range of 0 to 14 allows for a comprehensive assessment of most substances encountered in cosmetics and skin care, making it essential for professionals in the beauty industry to understand this scale when formulating products or assessing skin conditions. The other ranges presented do not encompass the full spectrum of the pH scale. For example, a range of 0 to 10 does not adequately reflect the full extent of acidic to alkaline solutions, and limiting the scale to 1 to 12 excludes important pH levels that are relevant in various applications, particularly in cosmetics and skincare formulations.