NIC Nail Technician Written ExamScientific ConceptsMedium
A technician is preparing to use a chemical product that has a pH of 12. According to the pH scale, this product is considered:
- ANeutral
- BHighly acidic
- CHighly alkaline
- DSlightly acidic
Show answer & explanationAnswer & explanation
Correct answer: C. Highly alkaline
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 12 is significantly above 7, indicating a highly alkaline substance.
Why the other options are wrong
- A. Neutral substances have a pH of 7.
- B. Highly acidic substances have a pH closer to 0 or 1.
- D. Slightly acidic substances have a pH between 4 and 6.
pH Scale
A scale from 0 to 14 used to specify the acidity or alkalinity of a solution, with 7 being neutral, below 7 acidic, and above 7 alkaline.
- 0-6.9 is acidic.
- 7 is neutral.
- 7.1-14 is alkaline (basic).
- Extreme values (0-2, 12-14) are highly corrosive.
Memory trick: Acid is 0-6, Neutral is 7, Alkali is 8-14.