Why aqueous solution of methyl amine reacts with Iron(III) Chloride to form ppt. iron(III) hydroxide?

Asked by piyush das | 31st Aug, 2011, 10:23: AM

Expert Answer:


Aqueous methylamine reacts with ferric chloride to precipitate hydrated ferric oxide:


Due to the +I effect of-CH3 group, methylamine is more basic than water. Therefore, in water, methylamine produces OH- ions by accepting H+ ions from water.

CH3-NH2   + H2O    CH3-NH3+    + OH-

Ferric chloride dissociates in water to form Fe3+  and  Cl- ions.

Then, OH- ion reacts with Fe3+ ion to form precipitate of hydrated ferric oxide.


Fe3+   +  6OH-   Fe2O3.3H2O

                           Hydrated ferric oxide

Answered by  | 1st Sep, 2011, 10:27: AM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.