Final answer:
As more hydroxyl ions are released into a solution, the substance becomes more basic.
Step-by-step explanation:
A base is a substance that releases hydroxyl ions (OH-) in solution, or one that accepts H+ already present in solution. The more hydroxyl ions released into a solution, the more basic the substance is. Bases combine with the H+ present to form a water molecule, thereby reducing the solution's acidity. Strong bases release most or all of their hydroxyl ions, while weak bases release only some or absorb a few H+.