How did Arrhenius define acids and bases? Choose a strong acid and a weak base from the following substances:

How did Arrhenius define acids and bases? Choose a strong acid and a weak base from the following substances:
CH3COOH, NH4OH, HCl, KOH.

According to Arrhenius theory, acids are substances that produce H+ ions when mixed with water. On the other hand bases are substances that produce OH- ions when mixed with water.

NH4OH is a weak base and HCl is a strong acid.