Hoàn thành dãy biến hóa sau:
Al ––> Al2(SO4)3 ––> AlCl3 ––> Al(OH)3 ––> Al2O3
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\(a,\) \(2Fe+3Cl_2->2FeCl_3\)
\(FeCl_3+3NaOH->Fe\left(OH\right)_3+3NaCl\)
\(2Fe\left(OH\right)_3->Fe_2O_3+3H_2O\)
\(Fe_2O_3+3CO->2Fe+3CO_2\)
\(Fe+2HCl->FeCl_2+H_2\)
dễ
a, Fe + HCl(dư) ---> FeCl3
FeCl3 + NaOH ---> Fe(OH)3 + naCl
Fe(OH)3 ---> (nhiệt phân) Fe2O3 + h2O
fe2o3 + h2------> fe + h2o
b, al2o3 + h2 -------> al + h2o
Al+ h2SO4 -----------> AL2(SO4)3 + H2
AL2(SO4)3 + BACL2 ----------> alcl3 + baso4
alcl3 + naoh ------> nacl + al(oh)3
TỰ CÂN BẰNG NHA
a,1 2Fe+3Cl2->2FeCl3
2 FeCl3+NaOH->Fe(OH)3+NaCl
3 2Fe(OH)3->Fe2O3+3H2O(nhiệt phân)
4 Fe2O3+3CO->2Fe+3CO2
b,1 2Al2O3->4Al+3O2( điện phân nóng chảy)
2 2Al+3H2SO4(loãng)->Al2(SO4)3+3H2
3 Al2(SO4)3+3BaCl2->2AlCl3+3BaSO4
4 AlCl3+3NaOH->Al(OH)3+3NaCl
tick nha
4Al+3O2\(\overset{t^0}{\rightarrow}\)2Al2O3
Al2O3+6HCl\(\rightarrow\)2AlCl3+3H2
AlCl3+3NaOH\(\rightarrow\)Al(OH)3+3NaCl
2Al(OH)3+3H2SO4\(\rightarrow\)Al2(SO4)3+6H2O
Al+O2→Al2O3( có nhiệt độ)
Al2O3+HCl→AlCl3+H2O
AlCl3+ NaOH→Al(OH)3+NaCl
Al(OH)3+H2SO4→Al2(SO4)3+H2O
(bạn tự cân bằng nhé)
AlCl3 +3 NaOH-->Al(OH)3 + 3NaCl
Al(OH)3 + NaOH----->NaAlO2+2H2O
Al2O3+ 2NaOH------>2NaAlO2+H2O
Alcl3----->al(OH)
AlCl3 + 3NaOH -> Al(OH)3 + 3NaCl
Al(OH)3 ---->NaAlo2
Al(OH)3 + NaOH -> NaAlO2 + 2H2O
Al2o3 ------>NaAlo2
Al2O3 + 2NaOH -> 2NaAlO2 + H2O
a.
\(\left(1\right)Fe+2HCl--->FeCl_2+H_2\)
\(\left(2\right)FeCl_2+2NaOH--->2NaCl+Fe\left(OH\right)_2\)
\(\left(3\right)4Fe\left(OH\right)_2+O_2+2H_2O\overset{t^o}{--->}4Fe\left(OH\right)_3\)
\(\left(4\right)2Fe\left(OH\right)_3\overset{t^o}{--->}Fe_2O_3+3H_2O\)
\(\left(5\right)Fe_2O_3+6HCl--->2FeCl_3+3H_2O\)
b.
\(\left(1\right)4Al+3O_2\overset{t^o}{--->}2Al_2O_3\)
\(\left(2\right)Al_2O_3+6HCl--->2AlCl_3+3H_2O\)
\(\left(3\right)AlCl_3+3NaOH--->Al\left(OH\right)_3+3NaCl\)
\(\left(4\right)2Al\left(OH\right)_3\overset{t^o}{--->}Al_2O_3+3H_2O\)
\(\left(5\right)Al_2O_3+3H_2SO_4--->Al_2\left(SO_4\right)_3+3H_2O\)
\(b,\left(1\right)4Al+3O_2\rightarrow^{t^o}2Al_2O_3\\ \left(2\right)Al_2O_3+6HCl\rightarrow2AlCl_3+3H_2O\\ \left(3\right)AlCl_3+3NaOH\rightarrow Al\left(OH\right)_3+3NaCl\\ \left(4\right)2Al\left(OH\right)_3\rightarrow^{t^o}Al_2O_3+3H_2O\\ \left(5\right)Al_2O_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2O\)
\(a,\left(1\right)Fe+2HCl\rightarrow FeCl_2+H_2\\ \left(2\right)FeCl_2+2NaOH\rightarrow Fe\left(OH\right)_2+2NaCl_2\\ \left(3\right)4Fe\left(OH\right)_2+O_2+2H_2O\rightarrow4Fe\left(OH\right)_3\\ \left(4\right)2Fe\left(OH\right)_3\rightarrow^{t^o}Fe_2O_3+3H_2O\\ \left(5\right)Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\)
Al+H2SO4 -> Al2(SO4)3+ H2 \(\uparrow\)
Al2(SO4)3 +HCl -> AlCl3+ H2SO4
AlCl3 +Ca(OH)2 -> Al(OH)3 +CaCl2
Al(OH)3 - to> Al2O3 +H20
\(2Al+3H_2SO_4\to Al_2(SO_4)_3+3H_2\\ Al_2(SO_4)_3+3BaCl_2\to 3BaSO_4\downarrow+2AlCl_3\\ AlCl_3+3NaOH\to Al(OH)_3\downarrow+3NaCl\\ 2Al(OH)_3\xrightarrow{t^o} Al_2O_3+3H_2O\)