Question

what is the arrhenius definition of an acid? 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 an acid states that an acid is a substance that, when dissolved in water, increases the concentration of hydronium ions ($\ce{H_3O^+}$).
• The option "A substance that increases $\ce{OH^-}$ concentration when it is dissolved in water" describes an Arrhenius base.
• "A compound that donates protons" is the Brønsted - Lowry definition of an acid.
• "A compound that accepts protons" is the Brønsted - Lowry definition of a base.

Answer:

A. A substance that increases $\ce{H_3O^+}$ concentration when it is dissolved in water.