A weak acid is one that partially dissociates into its ions in an aqueous solution. Among the options commonly provided:
- Acetic acid (CH₃COOH) is a weak acid because it ionizes only partially in water.
- Hydrofluoric acid (HF) is also considered a weak acid compared to other strong acids like HCl, HNO₃, and HI.
Therefore, both acetic acid (CH₃COOH) and hydrofluoric acid (HF) are examples of weak acids.