1.\(Ba{(OH)_2} + N{a_2}C{O_3} \to BaCO{}_3 + 2NaOH\)
2. \(2FeC{l_3} + 3Ba{\left( {OH} \right)_2} \to \)\(2Fe{\left( {OH} \right)_3} + 3BaC{l_2}\)
3. \({(N{H_4})_2}S{O_4} + 2KOH \to \)\(2N{H_3} + 2{H_2}O + {K_2}S{O_4}\)
4. \(Na{}_2S{\rm{ }} + {\rm{ }}HCl \to NaCl + {H_2}S\)
5. \(NaOH + HClO \to NaClO + {H_2}O\)
6. \(C{O_2} + 2NaOH \to N{a_2}C{O_3} + {H_2}O\)