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Multiple Choice
Which of the following compounds is considered a strong acid in aqueous solution?
A
Water (H2O)
B
Acetic acid (CH3COOH)
C
Ammonia (NH3)
D
Hydrochloric acid (HCl)
Verified step by step guidance
1
Understand the concept of acid strength: Strong acids completely dissociate in water, releasing all their hydrogen ions (H⁺), while weak acids only partially dissociate.
Identify the chemical formula for each compound: Water (H₂O), Acetic acid (CH₃COOH), Ammonia (NH₃), and Hydrochloric acid (HCl).
Recall the common strong acids: Hydrochloric acid (HCl) is a well-known strong acid, meaning it fully dissociates in aqueous solution.
Compare the dissociation behavior: Water (H₂O) is neutral, Acetic acid (CH₃COOH) is a weak acid, and Ammonia (NH₃) is a weak base. Hydrochloric acid (HCl) is the only strong acid among the options.
Conclude that Hydrochloric acid (HCl) is considered a strong acid in aqueous solution due to its complete dissociation into H⁺ and Cl⁻ ions.