Câu hỏi của duongquocthang

Question

thực hiện dãy biến hóa hóa học sau:

a)Fe→FeCl2→Fe(OH)2→FeO→Fe

b)Fe→FeCl3→Fe(OH)3→Fe2(SO4)3

c)Fe→Al2O3→AlCl3→Al(NO3)3→Al(OH)3→Al2O3

d)Na→NaOH→NaCl→NaNO3

e)Ca→CaO→Ca(OH)2→Ca(NO3)→CaSO4

Chu Hiếu · Accepted Answer

a, Fe + 2HCl $\rightarrow$ FeCl2 + H2

FeCl2 + 2NaOH $\rightarrow$ Fe(OH)2 + 2NaCl

Fe(OH)2 $\rightarrow$ FeO + H2O

FeO + CO $\rightarrow$ Fe + CO2

b, 2Fe + 3Cl2 $\rightarrow$ 2FeCl3

FeCl3 + 3NaOH $\rightarrow$ Fe(OH)3 + 3NaCl

2Fe(OH)3 + 3H2SO4 $\rightarrow$ Fe2(SO4)3 + 6H2O

c, 4Al + 3O2 $\rightarrow$ 2Al2O3

Al2O3 + 6HCl $\rightarrow$ 2AlCl3 + 3H2O

AlCl3 + 3AgNO3 $\rightarrow$ Al(NO3)3 + 3AgCl

Al(NO3)3 + 3NaOH $\rightarrow$ Al(OH)3 + 3NaNO3

2Al(OH)3 $\rightarrow$ Al2O3 + 3H2O

d, 2Na + 2H2O $\rightarrow$ 2NaOH + H2

NaOH + HCl $\rightarrow$ NaCl + H2O

NaCl + AgNO3 $\rightarrow$ NaNO3 + AgCl

e, 2Ca + O2 $\rightarrow$ 2CaO

CaO + H2O $\rightarrow$ Ca(OH)2

Ca(OH)2 + 2AgNO3 $\rightarrow$ Ca(NO3)2 + 2AgOH

Ca(NO3)2 + H2SO4 $\rightarrow$ CaSO4 + 2HNO3Câu trả lời: a, Fe + 2HCl $\rightarrow$ FeCl2 + H2