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Multiple Choice
Which of the following compounds is considered a strong acid in aqueous solution?
A
Hydrochloric acid (HCl)
B
Ammonia (NH3)
C
Water (H2O)
D
Acetic acid (CH3COOH)
Verified step by step guidance
1
Identify the definition of a strong acid: A strong acid is one that completely ionizes (dissociates) in water, releasing all of its hydrogen ions (H⁺) into the solution.
Examine Hydrochloric acid (HCl): In aqueous solution, HCl dissociates completely into H⁺ and Cl⁻ ions, making it a strong acid.
Consider Ammonia (NH₃): Ammonia is a weak base, not an acid, as it tends to accept protons rather than donate them.
Evaluate Water (H₂O): Water is neutral and does not act as a strong acid; it can act as both an acid and a base but does not completely dissociate to release H⁺ ions.
Analyze Acetic acid (CH₃COOH): Acetic acid is a weak acid because it only partially ionizes in water, releasing some but not all of its hydrogen ions.