Is an example of an Arrhenius base A. KOH B. HCl C. CaCO3 D. NH3?

D. NH3. An Arrhenius base is a substance that increases the concentration of hydroxide ions (OH-) in an aqueous solution. Ammonia (NH3) can accept a proton (H+) to form ammonium (NH4+) and hydroxide ion (OH-), making it a base according to the Arrhenius definition.