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Why is it necessary to use acetic acid a...

Why is it necessary to use acetic acid and not `H_2SO_4` for acidification of sodium extract for testing sulphur using lead acetate test?

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If `H_2SO_4` is used, lead acetate reacts with it to form a white precipitate of `PhSO_4` which hinders the test. In pressure of acetic acid, lead acetate is soluble and does not interfere with the test.
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