Understand the difference between strong and weak acids: Strong acids completely dissociate in water, releasing all their hydrogen ions (H\_3O\^+), while weak acids only partially dissociate, establishing an equilibrium between the undissociated acid and its ions.
Identify the acids given: H\_2SO\_4 (sulfuric acid), HCl (hydrochloric acid), HNO\_3 (nitric acid), and CH\_3COOH (acetic acid).
Recall that H\_2SO\_4, HCl, and HNO\_3 are commonly known as strong acids because they dissociate almost completely in aqueous solution.
Recognize that CH\_3COOH (acetic acid) is a weak acid because it only partially dissociates in water, meaning it does not release all of its hydrogen ions.
Conclude that among the options, CH\_3COOH is the weak acid due to its partial ionization and equilibrium behavior in solution.