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Chemical Properties of Phenols

SO2-4 gives w...

Question

$S O_{4}^{2 -}$ gives white ppt with lead acetate but the ppt dissolves in ammonium acetate solution. Explain.

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Solution

Sulphate ion reacts with lead acetate to form white precipitate of lead sulphate.
$S O_{4}^{2 -} + P b (C H_{3} C O O)_{2} \to P b S O_{4} w h i t e p r e c i p i t a t e + 2 C H_{3} C O O^{-}$
Lead sulphate reacts with ammonium acetate to form lead acetate and ammonium sulphate.
$2 C H_{3} C O O N H_{4} + P b S O_{4} W h i t e p p t ⟶ (C H_{3} C O O)_{2} P b + (N H_{4})_{2} S O_{4} s o l u b l e$
Hence, lead sulphate dissolves in ammonium chloride solution.

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According to above experiment complete the matrix.

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