Texas Cosmetology Operator Written ExamChemistryEasy
A cosmetologist is preparing to apply a chemical peel solution to a client's skin. The product label indicates a pH of 3.5. How would this solution be classified on the pH scale?
- ASlightly alkaline
- BNeutral
- CAcidic
- DStrongly alkaline
Show answer & explanationAnswer & explanation
Correct answer: C. Acidic
The pH scale ranges from 0 to 14. A pH of 7 is neutral. Values below 7 are acidic, and values above 7 are alkaline (or basic). A pH of 3.5 falls into the acidic range.
Why the other options are wrong
- A. Slightly alkaline solutions have a pH just above 7, typically 7.5-9.
- B. Neutral solutions have a pH of exactly 7.
- D. Strongly alkaline solutions have a pH much higher than 7, typically 10-14.
pH Scale
A logarithmic scale used to specify the acidity or alkalinity of an aqueous solution, ranging from 0 (most acidic) to 14 (most alkaline), with 7 being neutral.
- 0-6.9 = Acidic
- 7 = Neutral
- 7.1-14 = Alkaline (Basic)
Memory trick: Acids are Low, Bases are High, Neutral's Seven, Don't ask why!