Class 11Chemistry3 Organic Chemistry: Purification and CharacterisationChemical analysis of organic compounds
EasyWhy is it necessary to use acetic acid and not sulphuric acid for acidification of sodium extract for testing sulphur by lead acetate test?
(N/A) The $Na_2S$ present in the sodium extract reacts with lead acetate to form lead sulphide $(PbS)$ precipitate.
If $H_2SO_4$ is used for acidification,it reacts with lead acetate to form lead sulphate $(PbSO_4)$ precipitate,which interferes with the test.
Acetic acid is a weak acid and does not form a precipitate with lead acetate,thus allowing the specific detection of sulphur as $PbS$.
If $H_2SO_4$ is used for acidification,it reacts with lead acetate to form lead sulphate $(PbSO_4)$ precipitate,which interferes with the test.
Acetic acid is a weak acid and does not form a precipitate with lead acetate,thus allowing the specific detection of sulphur as $PbS$.
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In the Lassaigne sodium fusion test,$N$ and $S$ of an organic compound are converted into:
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|---|---|
| $A$. Aniline | $i$. Red colour with $FeCl_3$ |
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| $C$. Thiourea | $iii$. Blue colour with hot and acidic solution of $FeSO_4$ |
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