To determine which solution is a base based on pH values, it's important to know that the pH scale ranges from 0 to 14:
- A pH of 7 is considered neutral (pure water).
- A pH less than 7 indicates an acidic solution.
- A pH greater than 7 indicates a basic (alkaline) solution.
If Lila tests the pH of four different solutions, she should identify the solution with a pH greater than 7 as the base. For example, solutions with pH values of 8, 9, 10, or higher would be considered basic. If she provides the specific pH values for the four solutions, one can identify specifically which one is the base.