- $H ^{+}+ OH ^{-} \rightarrow H _{2} O$
- $Ba ^{2+}+2 OH ^{-}+2 H ^{+}+2 Cl ^{-} \rightarrow BaCl _{2}+2 H _{2} O$
- $Ba ^{2+}+2 Cl ^{-} \rightarrow BaCl _{2}$
- $Cl ^{-}+ H ^{+} \rightarrow HCl$