Final answer:
An Arrhenius base is a compound that increases the concentration of hydroxide ions in water. When dissolved in water, Arrhenius bases dissociate to form metal cations and hydroxide ions.
Step-by-step explanation:
An Arrhenius base is a compound that increases the concentration of OH- ions that are present when added to water. When Arrhenius bases dissolve in water, they dissociate into metal cations and hydroxide ions. One common example is sodium hydroxide (NaOH), which dissociates as follows:
NaOH(aq) → Na+(aq) + OH-(aq)
Therefore, the correct answer is (C) OH-.