Write a chemical equation for HF(aq) showing how it is an acid or a base according to the Arrhenius definition? Write a chemical equation for Ba(OH)2(aq) showing how it is an acid or a base according to the Arrhenius definition? Write a chemical equation for HC2H3O2(aq) showing how it is an acid or a base according to the Arrhenius definition? Really need some help with these. I understand most of it but can't come up with the right answers apparently.