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The strength of an acid is determined by its ability to donate a proton (H+ ion). The stronger the acid, the more readily it donates a proton. While strong acids completely dissociate in water, the rate at which they dissociate can vary. This means that one strong acid can be stronger than another strong acid if it dissociates more quickly. For example, hydrochloric acid (HCl) is a stronger acid than acetic acid (CH3COOH) because it dissociates more quickly in water.