Why acetic acid is used for detection of sulphur instead of sulphuric acid?
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When sodium extract is acidified with acetic acid and lead acetate is added to it, a black precipitate of lead sulphide is formed.
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When acetic acid is used, complete precipitation of sulphur in the form of lead sulphate occurs due to common ion effect. Hence, it is necessary to use acetic acid for acidification of sodium extract for testing sulphur by lead acetate test.
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