Hoàn thành dãy biến đỗi hóa học a) Al ➩ Al₂(SO₄)₃ ➩ Al(OH)₃ ➩ Al₂O₃ ➩ AlCl₃ b) Fe ➩ FeCl₃ ➩ Fe(OH)₃ ➩ Fe₂O₃ ➩ FeCl₃ c) CaCO₃ ➩ CaO ➩ Ca(OH)₂ ➩ CaCl₂ ➩ Ca(NO₃)₂
2 câu trả lời
a,
2Al+ 3H2SO4 -> Al2(SO4)3+ 3H2
Al2(SO4)3+ 6NH3+ 6H2O-> 2Al(OH)3+ 3(NH4)2SO4
2Al(OH)3 (t*)-> Al2O3+ 3H2O
Al2O3+ 6HCl -> 2AlCl3+ 3H2O
b,
Fe+ 3/2Cl2 (t*)-> FeCl3
FeCl3+ 3NaOH -> Fe(OH)3+ 3NaCl
2Fe(OH)3 (t*)-> Fe2O3+ 3H2O
Fe2O3+ 6HCl -> 2FeCl3+ 3H2O
c,
CaCO3 (t*)-> CaO+ CO2
CaO+ H2O -> Ca(OH)2
Ca(OH)2+ 2HCl -> CaCl2+ 2H2O
CaCl2+ 2AgNO3 -> Ca(NO3)2+ 2AgCl
Al ➩ Al₂(SO₄)₃ ➩ Al(OH)₃ ➩ Al₂O₃ ➩ AlCl₃
2Al+ 3H2SO4 -> Al₂(SO₄)₃ + 3H2
Al₂(SO₄)₃ + 6NaOH ->2Al(OH)₃↓ + 3Na2SO4
2Al(OH)₃ -> Al₂O₃ + 3H2O
Al₂O₃ + 6HCl -> 2AlCl₃ + 3H2O
Fe ➩ FeCl₃ ➩ Fe(OH)₃ ➩ Fe₂O₃ ➩ FeCl₃
2Fe + 3Cl2 -> 2FeCl₃
FeCl₃ + 3NaOH -> Fe(OH)₃↓ +3 NaCl
2Fe(OH)₃ -> Fe2O3 + 3H2O
Fe₂O₃ + 6HCl -> 2FeCl₃ + 3H2O
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