To identify a substance as a strong base based on pH values, we need to consider the pH scale, which ranges from 0 to 14. A pH greater than 7 indicates a basic solution, while a pH less than 7 indicates an acidic solution. Strong bases typically have a pH significantly higher than 7.
Among the options provided:
- A. 11.0 - This is basic and could indicate a strong base.
- B. 2.5 - This is acidic.
- C. 8.3 - This is basic but not strongly so.
- D. 7.0 - This is neutral.
The best choice for identifying a strong base is: A. 11.0