Asked by ji
Which of these accurately describes why an acid is strong?
An acid is strong when it undergoes a reverse reaction.
An acid becomes strong when it is mixed with a base.
An acid’s strength is due to the amount present in a solution.
An acid is strong when it dissociates completely in water.
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GPT-5 mini
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Correct answer: "An acid is strong when it dissociates completely in water."
Brief explanation: A strong acid ionizes (donates protons) essentially completely in water, so virtually all acid molecules exist as H+ (or H3O+) and its conjugate base. Strength is an intrinsic property (related to a large acid dissociation constant, Ka, or very negative pKa), not the amount present (concentration) and not simply mixing with a base. The first option is incorrect because a strong acid has a negligible reverse reaction (the equilibrium lies far to the right), not that it "undergoes a reverse reaction."
Brief explanation: A strong acid ionizes (donates protons) essentially completely in water, so virtually all acid molecules exist as H+ (or H3O+) and its conjugate base. Strength is an intrinsic property (related to a large acid dissociation constant, Ka, or very negative pKa), not the amount present (concentration) and not simply mixing with a base. The first option is incorrect because a strong acid has a negligible reverse reaction (the equilibrium lies far to the right), not that it "undergoes a reverse reaction."
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