Chemistry Regents Practice Test 2025 – Complete Prep Resource

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How does a strong acid differ from a weak acid?

A strong acid completely dissociates in solution

A strong acid is characterized by its ability to completely dissociate in solution, meaning that it breaks apart entirely into its ions when dissolved in water. This complete dissociation leads to a high concentration of hydronium ions (H₃O⁺) in the solution, significantly lowering the pH and indicating the acid's strength.

In contrast, weak acids only partially dissociate in solution; they establish an equilibrium between the undissociated acid molecules and the ions produced. As a result, weak acids do not create as high a concentration of hydronium ions, reflecting a higher pH compared to strong acids of the same initial concentration.

This fundamental difference in behavior explains why the first choice accurately captures the essence of what distinguishes strong acids from weak acids.

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A weak acid completely dissociates in solution

Both strong and weak acids completely dissociate

Strong acids do not ionize in solution

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