Fe + HCl - > Fecl2 + H2
2FeCl2 + NaClO + 4NaOH + H2O -> 5NaCl + 2Fe(OH)3
2Fe(OH)3 -^t0-> Fe2o3 + 3H2O
Fe2O3 + 3H2 -t0-> 2Fe + 3H2O
* cái đâu tiên là \(FeCl_3\) không phải \(FeCl_2\)
\(Fe+Cl-->FeCl_3\)
\(FeCl_3+3NaOH-->Fe\left(OH\right)_3+3NaCl\)
\(2Fe\left(OH\right)_3-->Fe_2O_3+3H_2O\)
\(2Fe\left(OH\right)_3-->Fe_2O_3+3H_2O\)
\(\left(1\right)Fe+2HCl\rightarrow FeCl_2+H_2\)
\(\left(2\right)2FeCl_2+4NaOH+NaClO+H_2O\rightarrow5NaCl+2Fe\left(OH\right)_3\)
\(\left(3\right)2Fe\left(OH\right)_3-^{t^o}\rightarrow Fe_2O_3+3H_2O\)
\(\left(4\right)Fe_2O_3+3CO-^{t^o}\rightarrow2Fe+3CO_2\)
(1) Fe + 2HCl \(\rightarrow\) FeCl\(_2\) + H\(_2\)
(2) 4FeCl\(_2\) + 8NaOH + O\(_2\) + 2H\(_2\)O \(\rightarrow\) 8NaCl + 4Fe(OH)\(_3\)
(3) 2Fe(OH)\(_3\) \(\rightarrow\)(t\(^0\)) Fe\(_2\)O\(_3\) + 3H\(_2\)O
(4) Fe\(_2\)O\(_3\) + 3H\(_2\) \(\rightarrow\) (t\(^0\) ) 2Fe + 3H\(_2\)O