What does the pH scale measure?

• A. The acidity or alkalinity of a substance
• B. The color spectrum of a liquid
• C. The temperature of a chemical reaction
• D. The viscosity of a mixture

Answer: (A)

The pH scale is a numerical scale that specifically measures the acidity or alkalinity of a substance. Ranging from 0 to 14, a pH value of 7 is considered neutral, values below 7 indicate acidity, and values above 7 indicate alkalinity. This measurement is critical in many fields, including chemistry, biology, and cosmetology, as it impacts various chemical reactions and the overall stability of solutions, particularly in formulations used in hair care and chemical texturizing processes. Understanding pH is essential for professionals in the beauty industry, as it helps them select and apply products that will work effectively with the natural hair texture and conditions.