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कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

Account for the following: Methylamine in water reacts with ferric chloride to precipitate hydrated ferric oxide.

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प्रश्न

Account for the following:

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

लघु उत्तरीय
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उत्तर

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.

\[\ce{CH3-NH2 + H-OH -> H3N+-CH3 + OH-}\]

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

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

\[\ce{FeCl3 -> Fe^{3+} + 3Cl^-}\]

\[\ce{2Fe^{3+} + 6OH^- -> \underset{(Brown precipitate)}{Fe2O3.3H2O}}\]

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अध्याय 9: Amines - Exercises [पृष्ठ २७८]

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एनसीईआरटी Chemistry Part 1 and 2 [English] Class 12
अध्याय 9 Amines
Exercises | Q 9.3 (iii) | पृष्ठ २७८

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