- BaSO4+2HCl→BaCl2+H2SO4BaSO _{4}+2 HCl \rightarrow BaCl _{2}+ H _{2} SO _{4}
- Ca(HCO3)2+Na3PO4→Ca3(PO4)2+NaHCO3Ca \left( HCO _{3}\right)_{2}+ Na _{3} PO _{4} \rightarrow Ca _{3}\left( PO _{4}\right)_{2}+ NaHCO _{3}
- Al+H2O+NaOH→Al(OH)3Al + H _{2} O + NaOH \rightarrow Al ( OH )_{3}
- 2Na+CuSO4→Na2SO4+Cu2 Na + CuSO _{4} \rightarrow Na _{2} SO _{4}+ Cu