Classify the definitions as that of an Arrhenius acid, an Arrhenius base, or that of a different type of acid or base. Arrhenius acid definition Arrhenius base definition Answer Bank A substance that produces an excess of hydrogen ions (H+) in aqueous solution. A substance that produces an excess of hydroxide ions (OH) in aqueous solution. A substance that can donate a hydrogen ion to another substance. Different definition of acid or base A substance that can accept a hydrogen ion from another substance.