Question

It is not advisable to use sulphuric acid in place of acetic acid for acidification while testing sulphur by lead acetate test. Assign reason.

Answer 1

Lead acetate will react with sulphuric acid to give white precipitate of lead sulphate. This will interfere with the detection of the test for sulphur.
`underset("Lead acetate")((CH_(3)COO)_(2))Pb+H_(2)SO_(4) rarr underset("(White ppt.)")(PbSO_(4))+2 CH_(3)COOH`
Acetic acid `(CH_(3)COOH)` will not interfere in the detection of sulphur.