- Acids are chemical substances that ionize/dissociate in the presence of water to produce hydrogen ions (or hydroxonium ions).
- Acids can be classified into 2 categories:
- Strong acids
- Weak acids
- The strength of an acid depends on the degree of ionization/dissociation of the acid.
Strong acids are acids that ionise completely to form hydrogen ions in water.
Weak acids are acids that partly ionise to form hydrogen ions in water.