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Multiple Choice
Which of the following compounds is considered a strong acid in aqueous solution?
A
Ammonia (NH3)
B
Water (H2O)
C
Acetic acid (CH3COOH)
D
Hydrochloric acid (HCl)
Verified step by step guidance
1
Identify the nature of each compound listed: Ammonia (NH3) is a weak base, Water (H2O) is neutral, Acetic acid (CH3COOH) is a weak acid, and Hydrochloric acid (HCl) is a strong acid.
Understand the concept of acid strength: Strong acids completely dissociate in water, releasing a high concentration of hydrogen ions (H+).
Compare the dissociation of each compound in water: NH3 does not release H+ ions, H2O is neutral and does not dissociate significantly, CH3COOH partially dissociates, and HCl completely dissociates.
Recognize that the complete dissociation of HCl in water makes it a strong acid, as it releases a large amount of H+ ions compared to the other compounds.
Conclude that among the given options, Hydrochloric acid (HCl) is the compound considered a strong acid in aqueous solution due to its complete dissociation and high H+ ion concentration.