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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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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 will react with it forming white precipitate of lead sulphate.
`(CH_3 COO)_2 Pb+ H_2 SO_4 to underset("White ppt.")(Pb SO_4 +) 2CH_3 COOH`
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Why is it necessary to use acetic acid and not suplhuric acid for the acidification of sodium extract for testing suplhur by lead acetate test?

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