Lassaigne extract having $N a_{2} S$ when acidified with acetic acid and on addition of lead acetate produces a black precipitate of :

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Lead acetate test: Lassaigne extract is acidified with acetic acid and then lead acetate solution is added. Formation of a black precipitate confirms the presence of sulphur in the organic compound.
$N a_{2} S + P b (C H_{3} C O O)_{2} \to P b S Black ↓ + 2 C H_{3} C O O N a$

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The Cannizaro Reaction

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Lassaigne extract having Na2S when acidified with acetic acid and on addition of lead acetate produces a black precipitate of :

Lead acetate test: Lassaigne extract is acidified with acetic acid and then lead acetate solution is added. Formation of a black precipitate confirms the presence of sulphur in the organic compound. Na2S+Pb(CH3COO)2→PbSBlack ↓+2CH3COONa

Lassaigne extract having $N a_{2} S$ when acidified with acetic acid and on addition of lead acetate produces a black precipitate of :

Lead acetate test: Lassaigne extract is acidified with acetic acid and then lead acetate solution is added. Formation of a black precipitate confirms the presence of sulphur in the organic compound.
$N a_{2} S + P b (C H_{3} C O O)_{2} \to P b S Black ↓ + 2 C H_{3} C O O N a$