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Account for the following:

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

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 Due to the +I effect of methyl, \left(\mathrm{CH}_3\right) group methylamine is more basic than water. So water \mathrm{CH}_3 \mathrm{NH}_2 produces hydroxide ions by accepting H^{+} ions from water.

\mathrm{CH}_3 \mathrm{NH}_2+\mathrm{H}_2 \mathrm{O} \rightarrow \mathrm{CH}_3 \mathrm{~N}^{+} \mathrm{H}_3+\mathrm{OH}^{-}

Ferric chloride \left(\mathrm{FeCl}_3\right) dissociates in water into-                                                                                                                                                                  \mathrm{FeCl}_3 \rightarrow \mathrm{Fe}^{3+}+3 \mathrm{Cl}^{-}

The hydroxide ion \left(O H^{-}\right) reacts with F e^{3+}and forms a precipitate of  \mathrm{Fe}(\mathrm{OH})_3 (reddish brown ppt)                                     

  \mathrm{Fe}^{3+}+3 \mathrm{OH}^{-} \rightarrow \mathrm{Fe}(\mathrm{OH})_3

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