Question

which substance is an acid?○ lioh○ mg(oh)₂○ ch₃cooh○ nacl

Explanation:

• LiOH and Mg(OH)₂ are hydroxides, which are bases that release OH⁻ ions in solution.
• NaCl is a salt formed from a strong acid and strong base, neutral in nature.
• CH₃COOH (acetic acid) releases H⁺ ions in solution, fitting the definition of an acid.

Answer:

CH₃COOH