CO+H2O=CuO+HCl=CA(OH)2 +H2SO4=Cu+HCl=KOH+CO2=Na2O+H2O=
co + h20 -> Co2 + H2
cuo + 2hcl -> cucl2 + H20
cu + hcl -> cucl+ h2
koh + co2-> k2co3 + h20
na2o + h2o -> NaoH