Multiple Choice
Early hair-relaxer (lye) products were strongly basic. Which pH range best matches these early relaxer formulations?
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17. Acid and Base Equilibrium
The pH Scale
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Soapy water is typically basic. Which pH value is most likely for soapy water?
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Verified step by step guidance1
Recall that the pH scale ranges from 0 to 14, where pH 7 is neutral, values less than 7 are acidic, and values greater than 7 are basic (alkaline).
Understand that soapy water is basic because soap molecules are typically salts of weak acids and strong bases, which increase the concentration of OH⁻ ions in solution.
Identify that a basic solution will have a pH value greater than 7, so any pH value less than or equal to 7 (such as 1, 3, or 7) cannot represent soapy water.
Among the given options, select the pH value that is greater than 7, which indicates a basic solution; in this case, pH 12 is the only basic value provided.
Conclude that since soapy water is basic, the most likely pH value for it is 12, reflecting its alkaline nature.
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