The information here is to help you decide which structure of an acid or base will dominate at a particular pH. Lets do a general case. This makes sense as it tells us that the protonated form dominates in an acidic medium. This makes sense as it tells us that the deprotonated form dominates in the basic medium.
Lets look at an example.
These takes us through each of the forms in turn. 6.02 B is the dominant form.