Why is acetic acid & not nitric acid is used to acidify soda extract for testing of sulphur by lead acetate test?


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Lead acetate on reacting with sulphuric acid will give a white ppt of lead sulphate which interferes in the detection of sulphur. 

 (CH3COO )2Pb + H2SO4 ----------> PbSO4 + 2CH3COOH

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