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प्रश्न
Account for the following:
Methylamine in water reacts with ferric chloride to precipitate hydrated ferric oxide.
उत्तर १
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
उत्तर २
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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