Final answer:
Sodium hydroxide relaxers have a pH of 14.0, indicating a very strong base.
Step-by-step explanation:
The pH of sodium hydroxide relaxers is highly alkaline, indicating a basic solution. The pH scale ranges from 0 to 14, with a pH of 7 being neutral. Sodium hydroxide relaxers have a pH of 14.0, which is at the highest end of the scale and indicates a very strong base.