Acids donate protons and bases accept protons. When the hydrogen atom loses its electron, the proton is left. This is the hydrogen ion. The hydronium ion is a water molecule that has bonded to a hydrogen ion. Duration: 8:35.
The behavior of acids and bases can be classified as strong or weak. Strong acids donate the hydrogen ion forcefully. Acid strength can be revealed by testing for how many ions are formed when the acid is added to water. Duration: 5:35.