What is a base?
What is an acid?
What does it mean if a solution has more hydrogen ions (H+)?
What does it mean if a solution has more hydroxide ions (OH-)?
What does it mean if a solution is neutral?
Explain the pH scale and how it is used to indicate acidic, alkaline, and neutral solutions.
What does it mean in terms of strength when the pH of an acid changes from 5 to 4?