Why must Lassaigne's extract be strictly boiled with concentrated before testing for halogens with ? — Practical Organic Chemistry and Purification Chemistry Question
Question
Why must Lassaigne's extract be strictly boiled with concentrated $HNO_3$ before testing for halogens with $AgNO_3$?
Answer: B
💡 Solution & Explanation
Boiling with $HNO_3$ expels $HCN$ and $H_2S$ gases. If left in solution, cyanide and sulphide ions would falsely precipitate as white $AgCN$ and black $Ag_2S$.
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