\(Fe+2HCl\rightarrow FeCl_2+H_2\\ FeCl_2+2NaOH\rightarrow Fe\left(OH\right)_2+2NaCl\\ Fe\left(OH\right)_2\rightarrow\left(t^o\right)FeO+H_2O\\ FeO+2HCl\rightarrow FeCl_2+H_2O\)
Fe+2HCl->FeCl2+H2
FeCl2+2NaOH->Fe(OH)2+2NaCl
Fe(OH)2-to>FeO+H2O
FeO+2HCl->FeCl2+H2O