Question

what is the bronsted-lowry definition of a base?
○ a compound that donates protons
○ a compound that accepts protons
○ a substance that increases hydroxide ion concentration
○ a substance that increases hydronium ion concentration

Explanation:

• The Brønsted - Lowry definition of an acid is a compound that donates protons, so the first option is incorrect.
• According to the Brønsted - Lowry theory, a base is a compound that accepts protons (hydrogen ions, $H^+$).
• The definition of a base as a substance that increases hydroxide ion concentration is the Arrhenius definition of a base, not Brønsted - Lowry, so the third option is wrong.
• A substance that increases hydronium ion concentration is the Arrhenius definition of an acid, so the fourth option is incorrect.

Answer:

B. a compound that accepts protons