Question

what is the arrhenius definition of a base?
a substance that increases h₃o⁺ concentration when it is dissolved in water.
a substance that increases oh⁻ concentration when it is dissolved in water
a compound that donates protons.
a compound that accepts protons

Explanation:

• The Arrhenius definition of a base states that a base is a substance that, when dissolved in water, increases the concentration of hydroxide ions ($\ce{OH-}$) in the solution.
• Option A describes an Arrhenius acid (increases $\ce{H3O+}$). Option C is the Bronsted - Lowry definition of an acid (donates protons), and Option D is the Bronsted - Lowry definition of a base (accepts protons).

Answer:

B. A substance that increases $\ce{OH-}$ concentration when it is dissolved in water