Which statement describes Arrhenius base?

Which statement describes Arrhenius base?

• A. A substance that donates OH- ions in aqueous solution
• B. A substance that accepts H+ ions
• C. A substance that donates electrons
• D. A substance that donates H+ ions

Answer: (A)

Arrhenius bases are substances that increase the concentration of hydroxide ions (OH-) in water. The statement describes exactly that: when the base is dissolved in aqueous solution, it supplies OH- ions, making the solution basic (higher pH). For example, sodium hydroxide dissociates to Na+ and OH-, adding OH- to the solution. In contrast, substances that donate H+ ions raise the hydronium (H3O+) concentration and are classified as acids in the Arrhenius sense. Donating electrons relates to redox chemistry, not acid-base behavior, and accepting H+ ions is a proton-accepting concept that belongs to other acid–base definitions.

Arrhenius bases are substances that increase the concentration of hydroxide ions (OH-) in water. The statement describes exactly that: when the base is dissolved in aqueous solution, it supplies OH- ions, making the solution basic (higher pH). For example, sodium hydroxide dissociates to Na+ and OH-, adding OH- to the solution. In contrast, substances that donate H+ ions raise the hydronium (H3O+) concentration and are classified as acids in the Arrhenius sense. Donating electrons relates to redox chemistry, not acid-base behavior, and accepting H+ ions is a proton-accepting concept that belongs to other acid–base definitions.