According to the Arrhenius definition, acids donate hydrogen ions (H⁺) while bases donate hydroxide ions (OH⁻) in an acid-base reaction. Therefore, the correct answer is option B: 'An acid donates an H, and a base donates an OH.'
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According to the Arrhenius definition, acids and bases react by transferring ions in solution. An acid donates hydrogen ions (H+), while bases donate hydroxide ions (OH-). Thus, the correct answer is that an acid donates an H+ and a base donates an OH-. ;