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Why is it necessary to use acetic acid a...

Why is it necessary to use acetic acid and not sulphuric acid for acidification of sodium extract for testing sulphur by lead acetate test?

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To detect the presence of sulphur, sodium extract is acidified with acetric acid because lead acetate being soluble does not interfere with the test. If sulphuric acid is used, lead acetate will react with sulphuric acid to form white precipitate of lead sulphate which will interfere with the test.
`underset("Lead acetane")(pb(CH_(3)COO)_(2))+H_(2)SO_(4)tounderset("Lead sulphate")(pbSO_(4)darr)("White")+2CH_(3)COOH`
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