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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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Sulphur sodium extract is acidified with acetic acid because lead acetate is soluble and does not interfere with the test.
`underset("Lead acetate")(Pb(OCOCH_(3))_(2))+H_(2)SO_(4)rarrPbSO_(4)darr+2CH_(3)COOH`
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