Question

Which of the following is the Arrhenius definition of an acid?

a. a substance that donates a hydrogen ion to another substance during a reaction
b. a substance that increases the concentration of hydronium ions when dissolved in water
c. a substance that accepts a lone-pair of electrons during a reaction
d. a substance that has a pH less than 7

Answer 1

Arrhenius is a substance that dissociates in water to produce hydrogen ions (H+) and there is a clear answer which coincides with this definition. The correct answer is definitely b. a substance that increases the concentration of hydronium ions when dissolved in water.