\(X\left\{\begin{matrix} Al_2O_3& & \\ MgO& & \\ Fe & & \\ Cu & & \end{matrix}\right.\overset{HCdu}{\rightarrow} ddY \left\{\begin{matrix} AlCl_3 & & \\ MgCl_2& & \\ FeCl_2& & \\ HCl_{du}& & \end{matrix}\right.+ Z: H_2+ CR _A: Cu\)
\(CR_A: Cu+ H_2SO_4\) (đặc, nóng) \(\rightarrow khi B: SO_2 \overset{+Ca(OH)_2}{\rightarrow} ktD: CaSO_3\)
\(ddY+ NaOH\rightarrow CR_E \left\{\begin{matrix} Al(OH) _3& & \\ Mg(OH)_2 & & \\ Fe(OH)_2 & & \end{matrix}\right.+ \overset{kk, t^{0}}{\rightarrow} CR_G\left\{\begin{matrix} Al_2O_3 & & \\ MgO & & \\ Fe_2O_3 & & \end{matrix}\right.\)
(Vì NaOH+ddY thu được kết tủa lớn nhất nên Al(OH)3 ko bị hòa tan)
PTPỨ:
\(Al_2O_3+6HCl\rightarrow 2AlCl_3+H_2O\)
\(MgO+2HCl\rightarrow MgCl_2 + H_2O\)
\(Fe+2HCl\rightarrow FeCl_2+ H_2O\)
\(Cu+2H_2SO_4\) (đặc, nóng) \(\rightarrow CuSO_4 + SO_2+2H_2O\)
\(SO_2+Ca(OH)_2\rightarrow CaSO_3+H_2O\)
\(AlCl_3+3NaOH\rightarrow Al(OH)_3+3NaCl\)
\(MgCl_2+2NaOH\rightarrow Mg(OH)_2+2NaCl\)
\(FeCl_2+2NaOH\rightarrow Fe(OH)_2+2NaCl\)
\(HCl+NaOH\rightarrow NaCl+H_2O\)
\(2Al(OH)_3\overset{t^{0}}{\rightarrow}Al_2O_3+3H_2O\)
\(Mg(OH)_2\overset{t^{0}}{\rightarrow}MgO+H_2O\)
\(2Fe(OH)_2+\frac{1}2{}O_2\overset{t^{0}}{\rightarrow}Fe_2O_3+2H_2O\)