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Multiple Choice
Which of the following compounds is considered a strong acid in aqueous solution?
A
Ammonia (NH3)
B
Hydrochloric acid (HCl)
C
Acetic acid (CH3COOH)
D
Water (H2O)
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: Ammonia (NH₃), Hydrochloric acid (HCl), Acetic acid (CH₃COOH), and Water (H₂O).
Recall common strong acids: Hydrochloric acid (HCl) is a well-known strong acid, meaning it fully dissociates in aqueous solution.
Compare dissociation behavior: Ammonia (NH₃) is a weak base, Acetic acid (CH₃COOH) is a weak acid, and Water (H₂O) is neutral, none of which fully dissociate like HCl.
Conclude based on dissociation: Hydrochloric acid (HCl) is the compound that is considered a strong acid in aqueous solution due to its complete dissociation.