Mọi người giúp em với Viết các PTHH thực hiện các chuỗi biến hóa sau, ghi rõ điều kiện phản ứng (nếu có): 1. SO2 → Na2SO3 → Na2SO4 → NaOH → Na2CO3. 2. Fe→FeCl3 → Fe(OH)3 → Fe2O3 → Fe2(SO4)3 → FeCl3. 3. Fe → FeCl2 → Fe(NO3)2 → Fe(OH)2 → FeSO4.

2 câu trả lời

Giải thích các bước giải:

1. SO2 → Na2SO3 → Na2SO4 → NaOH → Na2CO3

$SO_2+2NaOH→Na_2SO_3+H_2O$

$Na_2SO_3+H_2SO_4→Na_2SO_4+SO_2↑+H_2O$

$Na_2SO_4+Ba(OH)_2→BaSO_4↓+2NaOH$

2. Fe→FeCl3 → Fe(OH)3 → Fe2O3 → Fe2(SO4)3 → FeCl3

$Fe+Cl_2→FeCl_3$

$2FeCl_3+3Ba(OH)_2→2Fe(OH)_3↓+3BaCl_2$

$2Fe(OH)_3(to)→Fe_2O_3+3H_2O$

$Fe_2O_3+3H_2SO_4→Fe_2(SO_4)_3+3H_2O$

$Fe_2(SO_4)_3+3BaCl_2→3BaSO_4↓+2FeCl_3$

3. Fe → FeCl2 → Fe(NO3)2 → Fe(OH)2 → FeSO4

$Fe+2HCl→FeCl_2+H_2↑$

$FeCl_2+2AgNO_3→2AgCl↓+Fe(NO_3)_2$

$Fe(NO_3)_2+2NaOH→2NaNO_3+Fe(OH)_2↓$

$Fe(OH)_2+H_2SO_4→FeSO_4+H_2O$

Các phản ứng xảy ra:

1)

\(2NaOH + S{O_2}\xrightarrow{{}}N{a_2}S{O_3} + {H_2}O\)

\(N{a_2}S{O_3} + {H_2}S{O_4}\xrightarrow{{}}N{a_2}S{O_4} + S{O_2} + {H_2}O\) 

\(N{a_2}S{O_4} + Ba{(OH)_2}\xrightarrow{{}}BaS{O_4} + 2NaOH\)

\(2NaOH + C{O_2}\xrightarrow{{}}N{a_2}C{O_3} + {H_2}O\)

2)

\(2Fe + 3C{l_2}\xrightarrow{{{t^o}}}2FeC{l_3}\)

\(FeC{l_3} + 3NaOH\xrightarrow{{}}Fe{(OH)_3} + 3NaCl\)

\(2Fe{(OH)_3}\xrightarrow{{{t^o}}}F{e_2}{O_3} + 3{H_2}O\)

\(F{e_2}{O_3} + 3{H_2}S{O_4}\xrightarrow{{}}F{e_2}{(S{O_4})_3} + 3{H_2}O\)

\(F{e_2}{(S{O_4})_3} + 3BaC{l_2}\xrightarrow{{}}2FeC{l_3} + 3BaS{O_4}\)

3)

\(Fe + 2HCl\xrightarrow{{}}FeC{l_2} + {H_2}\)

\(FeC{l_2} + Pb{(N{O_3})_2}\xrightarrow{{}}PbC{l_2} + Fe{(N{O_3})_2}\)

\(Fe{(N{O_3})_2} + 2NaOH\xrightarrow{{}}Fe{(OH)_2} + 2NaN{O_3}\)

\(Fe{(OH)_2} + {H_2}S{O_4}\xrightarrow{{}}FeS{O_4} + 2{H_2}O\)

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