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Multiple Choice
Which of the following compounds is considered a strong acid in aqueous solution?
A
Acetic acid (CH3COOH)
B
Hydrochloric acid (HCl)
C
Water (H2O)
D
Ammonia (NH3)
Verified step by step guidance
1
Understand the concept of acid strength: Strong acids completely dissociate in water, releasing all their hydrogen ions (H⁺). Weak acids only partially dissociate.
Identify the chemical formula of each compound: Acetic acid (CH₃COOH), Hydrochloric acid (HCl), Water (H₂O), Ammonia (NH₃).
Evaluate the dissociation behavior of each compound in water: Hydrochloric acid (HCl) is known to completely dissociate, making it a strong acid.
Compare the dissociation of acetic acid (CH₃COOH) and ammonia (NH₃): Acetic acid is a weak acid as it partially dissociates, and ammonia is a weak base.
Conclude that hydrochloric acid (HCl) is the strong acid among the given options due to its complete dissociation in aqueous solution.