For testing the presence of sulphur by lead acetate test, the Lassaigne's extract is acidified with dilute acetic acid. Can we use dilute hydrochloric or sulphuric acid instead of acetic acid ?

For testing the presence of sulphur by lead acetate test, the Lassaign

1.	For testing the presence of sulphur by lead acetate test, the Lassaigne's extract is acidified with dilute acetic acid. Can we use dilute hydrochloric or sulphuric acid instead of acetic acid ?
Answer» Solution :For testing sulphur, the Lassaigne's extract is acidified with acetic because LEAD acetate is soluble and does not INTERFERE with the test. However, it HCL or `H_(2)SO_(4)` is used, lead acetate with REACT with it forming while ppt. of `PbCl_(2)` or `PbSO_(4)` and, therefore, it will interfere with the test. `{:((CH_(3)COO)_(2)Pb,+,2HCl,rarr,2CH_(3)COOH,+,PbCl_(2)),("Lead acetate",,,,"Acetic acid",,"(While ppt.)"),((CH_(3)COO)_(2)Pb,+,H_(2)SO_(4),rarr,2CH_(3)COOH,+,PbSO_(4)),(,,,,,,"(While ppt.)"):}`