Why 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) For testing sulphur,the sodium extract is acidified with acetic acid because lead acetate is soluble and does not interfere with the test. If $H_{2}SO_{4}$ were used,lead acetate itself will react with $H_{2}SO_{4}$ to form a white precipitate of lead sulphate,which will interfere with the test.
$H_{2}SO_{4} + Pb(CH_{3}COO)_{2} \rightarrow PbSO_{4(s)} + 2CH_{3}COOH$
$H_{2}SO_{4}$ (Sulphuric acid) reacts with $Pb(CH_{3}COO)_{2}$ (Lead acetate) to form $PbSO_{4}$ (White precipitate).
$H_{2}SO_{4} + Pb(CH_{3}COO)_{2} \rightarrow PbSO_{4(s)} + 2CH_{3}COOH$
$H_{2}SO_{4}$ (Sulphuric acid) reacts with $Pb(CH_{3}COO)_{2}$ (Lead acetate) to form $PbSO_{4}$ (White precipitate).
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