- Strong acids completely dissociate in water (e.g., HCl, H₂SO₄, HNO₃). - Strong bases completely dissociate in water (e.g., NaOH, KOH, Ca(OH)₂). - Weak acids and weak bases only partially dissociate in water. Formic acid (HCOOH) is a weak acid. Ammonia (NH₃) is a weak base.