Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12
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Account for the Following: Methylamine in Water Reacts with Ferric Chloride to Precipitate Hydrated Ferric Oxide. - Chemistry

Account for the following:

Methylamine in water reacts with ferric chloride to precipitate hydrated ferric oxide.

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Solution 1

Methylamine in water 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.

Ferric chloride (FeCl3) dissociates in water to form Fe3+ and Cl ions.

`FeCl_3 -> Fe^(3+) + 3Cl^(-)`

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

`2Fe^(3+) + 6OH^(-) -> Fe_2O_3. 3H_2O`

                                        Hydrated

                                       ferric oxide

 

Solution 2

Methylamine being more basic than water, accepts a proton from water liberating OH ions,

These `OH^(-)` ions combine with `Fe^(3+)` ions present in `H_2O` to form brown precipitate of hydrate ferric oxide.

`FeCl_3 -> Fe^(3+) + 3Cl^(-)`

`2Fe^(3+) + 6OH^(-) ->`

`2Fe(OH)_3 or Fe_2O_3. 3H_2O`

                  (Brown ppt)

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APPEARS IN

NCERT Class 12 Chemistry Textbook
Chapter 13 Amines
Q 3.3 | Page 400
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