Sắp xếp các chất sau đây thành dãy biến đổi hoá học: Fe, Fe(NO3)3, FeCl3, Fe2O3, Fe(OH)3, FeCl2
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(Ba\rightarrow Ba\left(OH\right)_2\rightarrow BaCl_2\rightarrow Ba\left(NO_3\right)_2\rightarrow BaCO_3\)
\(Ba+2H_2O\rightarrow Ba\left(OH\right)_2+H_2\uparrow\)
\(Ba\left(OH\right)_2+2HCl\rightarrow BaCl_2+2H_2O\)
\(BaCl_2+2AgNO_3\rightarrow Ba\left(NO_3\right)_2+2AgCl\downarrow\)
\(Ba\left(NO_3\right)_2+K_2CO_3\rightarrow2KNO_3+BaCO_3\downarrow\)
b) \(Fe\rightarrow Fe_3O_4\rightarrow Fe_2O_3\rightarrow Fe_2\left(SO_4\right)_3\rightarrow FeCl_3\rightarrow Fe\left(OH\right)_3\rightarrow Fe\left(NO_3\right)_3\)
\(3Fe+2O_2\xrightarrow[]{t^o}Fe_3O_4\)
\(2Fe_3O_4+\dfrac{1}{2}O_2\xrightarrow[]{t^o}3Fe_2O_3\)
\(Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\)
\(Fe_2\left(SO_4\right)_3+3BaCl_2\rightarrow2FeCl_3+3BaSO_4\downarrow\)
\(FeCl_3+3KOH\rightarrow Fe\left(OH\right)_3\downarrow+3KCl\)
\(Fe\left(OH\right)_3+3HNO_3\rightarrow Fe\left(NO_3\right)_3+3H_2O\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a. Dãy chuyển đổi hóa học:
\(Fe\rightarrow FeCl_3\rightarrow Fe\left(OH\right)_3\rightarrow Fe_2O_3\rightarrow Al_2O_3\rightarrow Al\)
b. Phương trình hoá học cho dãy chuyển đổi hoá học trên:
\(1.Fe+6HCl\rightarrow2FeCl_3+3H_2\)
\(2.FeCl_3+3NaOH\rightarrow3NaCl+Fe\left(OH\right)_3\)
\(3.2Fe\left(OH\right)_3\underrightarrow{t^0}Fe_2O_3+3H_2O\)
\(4.Fe_2O_3+2Al\rightarrow2Fe+Al_2O_3\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(Fe\left(NO_3\right)_3+3KOH\rightarrow3KNO_3+Fe\left(OH\right)_3\downarrow\)
\(2Fe\left(OH\right)_3\xrightarrow[]{t^o}Fe_2O_3+3H_2O\)
\(Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\)
\(2FeCl_3+Fe\rightarrow3FeCl_2\)
\(FeCl_2+\dfrac{1}{2}Cl_2\rightarrow FeCl_3\)
\(FeCl_3+3AgNO_3\rightarrow Fe\left(NO_3\right)_3+3AgCl\downarrow\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a,2Fe+3Cl_2\xrightarrow{t^o}2FeCl_3\\ FeCl_3+3NaOH\to Fe(OH)_3\downarrow+3NaCl\\ 2Fe(OH)_3\xrightarrow{t^o}Fe_2O_3+3H_2O\\ Fe_2O_3+3CO\xrightarrow{t^o}2Fe+3CO_2\\ Fe+H_2SO_4\to FeSO_4+H_2\\ FeSO_4+BaS\to BaSO_4\downarrow+FeS\\ FeS+2HCl\to FeCl_2+H_2\\ FeCl_2+2AgNO_3\to Fe(NO_3)_2+2AgCl\downarrow\)
\(b,2Al_2O_3\xrightarrow[criolit]{đpnc}4Al+3O_2\\ 2Al+3H_2SO_4\to Al_2(SO_4)_3+3H_2\\ Al_2(SO_4)_3+6NaOH\to 2Al(OH)_3\downarrow+3Na_2SO_4\\ Al(OH)_3+3HNO_3\to Al(NO_3)_3+3H_2O\\ 2Al(NO_3)_3+3Mg\to 3Mg(NO_3)_2+2Al\\ Al+NaOH+H_2O\to NaAlO_2+\dfrac{3}{2}H_2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(FeCl_2+2NaOH\to Fe(OH)_2\downarrow+2NaCl\\ 4Fe(OH)_2+2H_2O+O_2\xrightarrow{t^o}4Fe(OH)_3\\ 2Fe(OH)_3\xrightarrow{t^o}Fe_2O_3+3H_2O\\ Fe_2O_3+3CO\xrightarrow{t^o}2Fe+3CO_2\)
\(Fe\rightarrow FeCl_2\rightarrow FeCl_3\rightarrow Fe\left(NO_3\right)_3\rightarrow Fe\left(OH\right)_3\rightarrow Fe_2O_3\\ Fe+2HCl\rightarrow FeCl_2+H_2\\ 2FeCl_2+Cl_2-^{t^o}\rightarrow2FeCl_3\\ FeCl_3+3AgNO_3\rightarrow Fe\left(NO_3\right)_3+3AgCl\\ Fe\left(NO_3\right)_3+3NaOH\rightarrow Fe\left(OH\right)_3+3NaNO_3\\ 2Fe\left(OH\right)_3-^{t^o}\rightarrow Fe_2O_3+3H_2O\)
Fe -> FeCl2 -> FeCl3 -> Fe(OH)3 -> Fe2O3 -> Fe(NO3)3
Fe+2 HCl -> FeCl2 + H2
2 FeCl2 + Cl2 ->(to) 2 FeCl3
FeCl3 + 3KOH -> Fe(OH)3 + 3KCl
2 Fe(OH)3 -> (to) Fe2O3 + 3 H2O
Fe2O3 + 6 HNO3 -> 2 Fe(NO3)3 + 3H2O