Cho sơ đồ chuyển hóa sau: \(Cr + HCl{\rm{ }}\left( l \right) \to \left( X \right) + C{l_2},t^\circ \to \left( M \right) + B{r_2} + KOH \to \left( Z \right) + {H_2}S{O_4}\left( l...

* Hướng dẫn giải

Có các phương trình:

1) \(Cr+2HC{{l}_{\left( l \right)}}\to CrC{{l}_{2}}\left( X \right)+{{H}_{2}}\)

2) \(2CrC{{l}_{2}}+C{{l}_{2}}\to 2CrC{{l}_{3}}\left( Y \right)\)

3) \(2CrC{{l}_{3}}+3B{{r}_{2}}+16KOH\to 2{{K}_{2}}Cr{{O}_{4}}\left( Z \right)+6KBr+6KCl+8{{H}_{2}}O\)

4) \(2{{K}_{2}}Cr{{O}_{4}}+{{H}_{2}}S{{O}_{4}}\to {{K}_{2}}C{{r}_{2}}{{O}_{7}}\left( T \right)+{{K}_{2}}S{{O}_{4}}+{{H}_{2}}O\)

5) \(6FeS{{O}_{4}}+{{K}_{2}}C{{r}_{2}}{{O}_{7}}+7{{H}_{2}}S{{O}_{4}}\to 3F{{e}_{2}}{{\left( S{{O}_{4}} \right)}_{3}}+C{{r}_{2}}{{\left( S{{O}_{4}} \right)}_{3}}\left( M \right)+{{K}_{2}}S{{O}_{4}}+7{{H}_{2}}O\)