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:

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

CH3NH2

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

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