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

13.3     Account for the following:

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

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Due to +I effect of methyl  (CH_{3}) group methylamine is more basic than water. So in water CH_{3}NH_{2} produces hydroxide ion by accepting H^{+} ions from water.

CH_{3}NH_{2}+H_{2}O\rightarrow CH_{3}N^{+}H_{3}+OH^{-}

Ferric chloride (FeCl_{3}) dissociates in water into-                                                                                                                                                                    FeCl_{3}\rightarrow Fe^{3+}+3Cl^{-}                                                                                                                                                                                              The hydroxide ion (OH^{-}) react with Fe^{3+} and form a precipitate of  Fe(OH)_{3} (reddish brown ppt)                                                                                                Fe^{3+}+3OH^{-}\rightarrow Fe(OH)_{3}   

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manish

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