Answer:
For testing sulphur, the sodium extract
is acidified with acetic acid because Load acetate is soluble and does not interfere
with the test. If \[{{H}_{2}}S{{O}_{4}}\] were used, lead acetate itself will
react with \[{{H}_{2}}S{{O}_{4}}\] to form white ppt. of lead sulphate which
interfere with the test.
\[\underset{Lead\,acetate}{\mathop{Pb{{(C{{H}_{3}}COO)}_{2}}}}\,+{{H}_{2}}S{{O}_{4}}\to
\underset{\begin{smallmatrix}
Lead\,sulphate \\
(White\,ppt.)
\end{smallmatrix}}{\mathop{PbS{{O}_{4}}}}\,\downarrow
2C{{H}_{3}}COOH\]
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