Question

Dựa vào các chuỗi phản ứng viết phương trình hóa học:

a) FeCl₃ -⁽¹⁾> Fe(OH)₂ -⁽²⁾> Fe₂O₃ -⁽³⁾> Fe₂(SO₄)₃ -⁽⁴⁾> FeCl₃ -⁽⁵⁾> CaCl₂.

b) SO₂ -⁽¹⁾> Na₂SO₃ -⁽²⁾> Na₂SO₄ -⁽³⁾> NaOH -⁽⁴⁾> Zn(OH)₂ -⁽⁵⁾> ZnO.

Answer 1

a,

Phải là FeCl3--->Fe(OH)3

\(\text{FeCl3 + 3NaOH -> Fe(OH)3 + 3NaCl }\)

\(\text{2Fe(OH)3 - to--> Fe2O3 + 3H2O}\)

\(\text{Fe2O3 + 3H2SO4 -> Fe2(SO4)3 + 3H2O}\)

\(\text{Fe2(SO4)3 + 3BaCl2 -> 2FeCl3 + 3BaSO4}\)

\(\text{2FeCl3 + 3Ca(OH)2 -> 2Fe(OH)3 + 3CaCl2}\)

b,

\(\text{SO2 + 2NaOH -> Na2SO3 + H2O}\)

\(\text{Na2SO3 + H2SO4 -> Na2SO4 + SO2 + H2O}\)

\(\text{Na2SO4 + Ba(OH)2 -> BaSO4 + 2NaOH}\)

\(\text{2NaOH + ZnCl2 -> Zn(OH)2 + 2NaCl}\)

\(\text{Zn(OH)2 --to--> ZnO + H2O}\)

Answer 2

https://i.imgur.com/rnZP74s.jpg

Answer 3

a) FeCl3+3NaOH---->Fe(OH)3+3NaCl

2Fe(OH)3--->Fe2O3+3H2O

Fe2O3+3H2SO4--->Fe2(SO4)3+3H2O

Fe2(SO4)3+ 3BaCl2--->3BaSO4+2FeCl3

2FeCl3+3Ca(OH)2--->3CaCl2+2Fe(OH)3

b) SO2+2NaOH---->Na2SO3+H2O

Na2SO3+H2SO4--->Na2SO4+H2O+SO2

Na2SO4+Ba(OH)2--->2NaOH+BaSO4

2NaOH+ZnCl2---->Zn(OH)2+2NaCl

Zn(OH)2--->ZnO+H2O