\(2Fe+3Cl_2\underrightarrow{t^o}2FeCl_3\)
\(FeCl_3+3NaCl\rightarrow3NaCl+Fe\left(OH\right)_2\)
\(2Fe\left(OH\right)_2\underrightarrow{t^o}Fe_2O_3+3H_2O\)
\(Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\)
\(Fe_2\left(SO_4\right)_3+6NaOH\rightarrow3Na_2SO_4+2Fe\left(OH\right)_3\)