- Nước: $K_2O$
$K_2O+H_2O\to 2KOH$
- Dung dịch $HCl$: $K_2O, CuO, FeO, PbO, ZnO$
$K_2O+2HCl\to 2KCl+H_2O$
$CuO+2HCl\to CuCl_2+H_2O$
$FeO+2HCl\to FeCl_2+H_2O$
$PbO+2HCl\to PbCl_2+H_2O$
$ZnO+2HCl\to ZnCl_2+H_2$
- Dung dịch $KOH$: $K_2O, PbO, ZnO$
$K_2O+H_2O\to 2KOH$
$PbO+2KOH\to K_2PbO_2+H_2O$
$ZnO+2KOH\to K_2ZnO_2+H_2O$
- $CaO$: không có
- $CO_2$: $K_2O$
$K_2O+CO_2\to K_2CO_3$
- $CO$: $CuO, FeO, PbO, ZnO$
$CuO+CO\xrightarrow{{t^o}} Cu+CO_2$
$FeO+CO\xrightarrow{{t^o}} Fe+CO_2$
$PbO+CO\xrightarrow{{t^o}} Pb+CO_2$
$ZnO+CO\xrightarrow{{t^o}} Zn+CO_2$
