During halogen test, sodium fusion extract is boiled with concentrated to

Question

During halogen test, sodium fusion extract is boiled with concentrated  to

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Step 1: Understand the Purpose of Boiling with HNO₃

In the Lassaigne test, the sodium extract (sodium fusion extract) may contain:
-  (if N was present)
-  (if S was present)
-  (if halogen was present)

Before testing for halogens with , the extract is boiled with dilute/concentrated .

Step 2: Why Boil with ?

If  and  are present alongside , adding  directly would produce:
-  (white ppt) — looks like AgCl and interferes with the halide test
-  (black ppt) — masks the halide precipitate

Boil

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