\(\left(1\right)CaO+CO_2\xrightarrow[]{}CaCO_3\\ \left(2\right)CaO+H_2O\xrightarrow[]{}Ca\left(OH\right)_2\\ \left(3\right)Ca\left(OH\right)_2+CO_2\xrightarrow[]{}CaCO_3+H_2O\\ \left(4\right)CaCO_3\xrightarrow[]{t^0}CaO+CO_2\\ \left(5\right)CaO+2HCl\xrightarrow[]{}CaCl_2+H_2O\)